Twelve Olympians in the context of Evander of Pallene

Religious practices in ancient Greece encompassed a collection of beliefs, rituals, and mythology, in the form of both popular public religion and cult practices. The application of the modern concept of "religion" to ancient cultures has been questioned as anachronistic. The ancient Greeks did not have a word for 'religion' in the modern sense. Likewise, no Greek writer is known to have classified either the gods or the cult practices into separate 'religions'. Instead, for example, Herodotus speaks of the Hellenes as having "common shrines of the gods and sacrifices, and the same kinds of customs".

Most ancient Greeks recognized the twelve major Olympian gods and goddesses—Zeus, Hera, Poseidon, Demeter, Athena, Ares, Aphrodite, Apollo, Artemis, Hephaestus, Hermes, and either Hestia or Dionysus—although philosophies such as Stoicism and some forms of Platonism used language that seems to assume a single transcendent deity. The worship of these deities, and several others, was found across the Greek world, though they often have different epithets that distinguished aspects of the deity, and often reflect the absorption of other local deities into the pan-Hellenic scheme.

Mycenaean Greece (or the Mycenaean civilization) was the last phase of the Bronze Age in ancient Greece, spanning the period from approximately 1750 to 1050 BC. It represents the first advanced and distinctively Greek civilization in mainland Greece with its palatial states, urban organization, works of art, and writing system. The Mycenaeans were mainland Greek peoples who were likely stimulated by their contact with insular Minoan Crete and other Mediterranean cultures to develop a more sophisticated sociopolitical culture of their own. The most prominent site was Mycenae, after which the culture of this era is named. Other centers of power that emerged included Pylos, Tiryns, and Midea in the Peloponnese, Orchomenos, Thebes, and Athens in Central Greece, and Iolcos in Thessaly. Mycenaean settlements also appeared in Epirus, Macedonia, on islands in the Aegean Sea, on the south-west coast of Asia Minor, and on Cyprus, while Mycenaean-influenced settlements appeared in the Levant and Italy.

The Mycenaean Greeks introduced several innovations in the fields of engineering, architecture and military infrastructure, while trade over vast areas of the Mediterranean was essential for the Mycenaean economy. Their syllabic script, Linear B, offers the first written records of the Greek language, and their religion already included several deities also to be found in the Olympic pantheon. Mycenaean Greece was dominated by a warrior elite society and consisted of a network of palace-centered states that developed rigid hierarchical, political, social, and economic systems. At the head of this society was the king, known as a wanax.

Olympia (Modern Greek: Ολυμπία [oli(m)ˈbi.a]; Ancient Greek: Ὀλυμπία [olympí.aː]), officially Archaia Olympia (Greek: Αρχαία Ολυμπία lit. 'Ancient Olympia'), is a small town in Elis on the Peloponnese peninsula in Greece, famous for the nearby archaeological site of the same name. The site was a major Panhellenic religious sanctuary of ancient Greece, where the ancient Olympic Games were held every four years throughout classical antiquity, from the 8th century BC to the 4th century AD. They were restored on a global basis in 1894 in honor of the ideal of peaceful international contention for excellence.

The sacred precinct, named the Altis, was primarily dedicated to Zeus, although other gods were worshipped there. The games conducted in his name drew visitors from all over the Greek world as one of a group of such "Panhellenic" centres, which helped to build the identity of the ancient Greeks as a nation. Despite the name, it is nowhere near Mount Olympus in northern Greece, where the twelve Olympians, the major deities of ancient Greek religion, were believed to live.

Ares (/ˈɛəriːz/; Ancient Greek: Ἄρης, Árēs [árɛːs]) is the Greek god of war and courage. He is one of the Twelve Olympians, and the son of Zeus and Hera. Many Greeks were ambivalent towards him. He embodies the physical valor necessary for success in war but can also personify sheer brutality and bloodlust, in contrast to his sister Athena, whose martial functions include military strategy and generalship. An association with Ares endows places, objects, and other deities with a savage, dangerous, or militarized quality.

Although Ares's name shows his origins as Mycenaean, his reputation for savagery was thought by some to reflect his likely origins as a Thracian deity. Some cities in Greece and several in Asia Minor held annual festivals to bind and detain him as their protector. In parts of Asia Minor, he was an oracular deity. Still further away from Greece, the Scythians were said to ritually kill one in a hundred prisoners of war as an offering to their equivalent of Ares. The later belief that ancient Spartans had offered human sacrifice to Ares may owe more to mythical prehistory, misunderstandings, and reputation than to reality.

Aphrodite (/ˌæfrəˈdaɪtiː/ , AF-rə-DY-tee) is an ancient Greek goddess associated with love, lust, beauty, pleasure, passion, procreation, and as her syncretised Roman counterpart Venus, desire, sex, fertility, prosperity, and victory. Aphrodite's major symbols include seashells, myrtles, roses, doves, sparrows, and swans. The cult of Aphrodite was largely derived from that of the Phoenician goddess Astarte, a cognate of the East Semitic goddess Ishtar, whose cult was based on the Sumerian cult of Inanna. Aphrodite's main cult centers were Cythera, Cyprus, Corinth, and Athens. Her main festival was the Aphrodisia, which was celebrated annually in midsummer. In Laconia, Aphrodite was worshipped as a warrior goddess. She was also the patron goddess of prostitutes, an association which led early scholars to propose the concept of sacred prostitution in Greco-Roman culture, an idea which is now generally seen as erroneous.

A major goddess in the Greek pantheon, Aphrodite featured prominently in ancient Greek literature. According to many sources, like Homer's Iliad and Sappho's Ode to Aphrodite, she is the daughter of Zeus and Dione. In Hesiod's Theogony, however, Aphrodite is born off the coast of Cythera from the foam (ἀφρός, aphrós) produced by Uranus's genitals, which his son Cronus had severed and thrown into the sea. In his Symposium, Plato asserts that these two origins actually belong to separate entities; Aphrodite Urania (a transcendent "Heavenly" Aphrodite, who "partakes not of the female but only of the male", with Plato describing her as inspiring love between men, but having nothing to do with the love of women) and Aphrodite Pandemos (Aphrodite common to "all the people" who Plato described as "wanton", to contrast her with the virginal Aphrodite Urania, who did not engage in sexual acts at all. Pandemos inspired love between men and women, unlike her older counterpart). The epithet Aphrodite Areia (the "Warlike") reveals her contrasting nature in ancient Greek religion. Aphrodite had many other epithets, each emphasizing a different aspect of the same goddess or used by a different local cult. Thus she was also known as Cytherea (Lady of Cythera) and Cypris (Lady of Cyprus), because both locations claimed to be the place of her birth. Sappho's Ode to Aphrodite is one of the earliest poems dedicated to the goddess and survives from the Archaic period nearly complete.

Poseidon (/pəˈsaɪdən, pɒ-, poʊ-/; Ancient Greek: Ποσειδῶν, romanised: Poseidôn) is one of the twelve Olympians in ancient Greek religion and mythology, presiding over the sea, storms, earthquakes and horses. He was the protector of seafarers and the guardian of many Hellenic cities and colonies. In pre-Olympian Bronze Age Greece, Poseidon was venerated as a chief deity at Pylos and Thebes, with the cult title "earth shaker"; in the myths of isolated Arcadia, he is related to Demeter and Persephone and was venerated as a horse, and as a god of the waters. Poseidon maintained both associations among most Greeks: he was regarded as the tamer or father of horses, who, with a strike of his trident, created springs (the terms for horses and springs are related in the Greek language). His Roman equivalent is Neptune.

Homer and Hesiod suggest that Poseidon became lord of the sea when, following the overthrow of his father Cronus, the world was divided by lot among Cronus' three sons; Zeus was given the sky, Hades the underworld, and Poseidon the sea, with the Earth and Mount Olympus belonging to all three. In Plato's Timaeus and Critias, the legendary island of Atlantis was Poseidon's domain. In Homer's Iliad, Poseidon supports the Greeks against the Trojans during the Trojan War. In the Odyssey, during the sea-voyage from Troy back home to Ithaca, the Greek hero Odysseus provokes Poseidon's fury by blinding his son, the Cyclops Polyphemus, resulting in Poseidon punishing him with storms, causing the complete loss of his ship and numerous of his companions, and delaying his return by ten years.

In ancient Greek religion, Hera (/ˈhɛrə, ˈhɪərə/; Ancient Greek: Ἥρα, romanized: Hḗrā; Ἥρη, Hḗrē in Ionic and Homeric Greek) is the goddess of marriage, women, and family, and the protector of women during childbirth. In Greek mythology, she is queen of the twelve Olympians and Mount Olympus, sister and wife of Zeus, and daughter of the Titans Cronus and Rhea. One of her defining characteristics in myth is her jealous and vengeful nature in dealing with any who offended her, especially Zeus's numerous adulterous lovers and illegitimate offspring.

Her iconography usually presents her as a dignified, matronly figure, upright or enthroned, crowned with a polos or diadem, sometimes veiled as a married woman. She is the patron goddess of lawful marriage. She presides over weddings, blesses and legalises marital unions, and protects women from harm during childbirth. Her sacred animals include the cow, cuckoo, and peacock. She is sometimes shown holding a pomegranate as an emblem of immortality. Her Roman counterpart is Juno.

In ancient Greek religion and mythology, Demeter (/dɪˈmiːtər/; Attic: Δημήτηρ Dēmḗtēr [dɛːmɛ́ːtɛːr]; Doric: Δαμάτηρ Dāmā́tēr) is the Olympian goddess of the harvest and agriculture, presiding over crops, grains, food, and the fertility of the earth. Although Demeter is mostly known as a grain goddess, she also appeared as a goddess of health, birth, and marriage, and had connections to the Underworld. She is also called Deo (Δηώ Dēṓ).

In Greek tradition, Demeter is the second child of the Titans Rhea and Cronus, and sister to Hestia, Hera, Hades, Poseidon, and Zeus. Like her other siblings except Zeus, she was swallowed by her father as an infant and rescued by Zeus. Through Zeus, she became the mother of Persephone, a fertility goddess and resurrection deity. One of the most notable Homeric Hymns, the Homeric Hymn to Demeter, tells the story of Persephone's abduction by Hades and Demeter's search for her. When Hades, the King of the Underworld, wished to make Persephone his wife, he abducted her from a field while she was picking flowers, with Zeus's leave. Demeter searched everywhere to find her missing daughter to no avail until she was informed that Hades had taken her to the Underworld. In response, Demeter neglected her duties as goddess of agriculture, plunging the earth into a deadly famine where nothing would grow, causing mortals to die. Zeus ordered Hades to return Persephone to her mother to avert the disaster. However, because Persephone had eaten food from the Underworld, she could not stay with Demeter forever, but had to divide the year between her mother and her husband, explaining the seasonal cycle as Demeter does not let plants grow while Persephone is gone.

Apollo is one of the Olympian deities in ancient Greek and Roman religion, as well as Greek and Roman mythology. Apollo has been recognized as a god of archery, music and dance, truth and prophecy, healing and diseases, the Sun and light, poetry, and more. One of the most important and complex of the Greek gods, he is the son of Zeus and Leto, and the twin brother of Artemis, goddess of the hunt. He is considered to be the most beautiful god and is represented as the ideal of the kouros (ephebe, or a beardless, athletic youth). Apollo is known in Greek-influenced Etruscan mythology as Apulu.

As the patron deity of Delphi (Apollo Pythios), Apollo is an oracular god—the prophetic deity of the Delphic Oracle and the deity of ritual purification. His oracles were often consulted for guidance in various matters. He was in general seen as the god who affords help and wards off evil, and is referred to as Alexicacus, the "averter of evil". Medicine and healing are associated with Apollo, whether through the god himself or mediated through his son Asclepius. Apollo delivered people from epidemics, yet he is also a god who could bring ill health and deadly plague with his arrows. The invention of archery itself is credited to Apollo and his sister Artemis. Apollo is usually described as carrying a silver or golden bow and a quiver of arrows.

In ancient Greek religion and mythology, Hestia (/ˈhɛstiə, ˈhɛstʃə/; Ancient Greek: Ἑστία, lit. 'hearth, fireplace, altar') is the virgin goddess of the hearth and the home. In myth, she is the firstborn child of the Titans Cronus and Rhea, and one of the Twelve Olympians.

In Greek mythology, newborn Hestia, along with four of her five siblings, was devoured by her father Cronus, who feared being overthrown by one of his offspring. Zeus, the youngest child, escaped with his mother's help, and made his father disgorge all his siblings. Cronus was supplanted by this new generation of deities; and Hestia thus became one of the Olympian gods, the new rulers of the cosmos, alongside her brothers and sisters. In spite of her status, she has little prominence in Greek mythology. Like Athena and Artemis, Hestia elected never to marry and remained an eternal virgin goddess instead, forever tending to the hearth of Olympus.

Heracles (/ˈhɛrəkliːz/ Ancient Greek: Ἡρακλῆς, lit. 'glory/fame of Hera'), born Alcaeus (Ἀλκαῖος, Alkaios) or Alcides (Ἀλκείδης, Alkeidēs), was a divine hero in Greek mythology, the son of Zeus and Alcmene, and the foster son of Amphitryon. He was a descendant of Perseus, another son of Zeus.

He was the greatest of the Greek heroes, the ancestor of royal clans known as Heracleidae (Ἡρακλεῖδαι), and a champion of the Olympian order against chthonic monsters. In Rome and the modern West, he is known as Hercules, with whom the later Roman emperors, in particular Commodus and Maximian, often identified themselves. Details of his cult were adapted to Rome as well.

The Temple of Olympian Zeus (Ancient Greek: Ναὸς τοῦ Ὀλυμπίου Διός, Naós tou Olympíou Diós), also known as the Olympieion or Columns of the Olympian Zeus, is a colossal temple in the centre of Athens, now in ruins. It was dedicated to "Olympian" Zeus, a name originating from his position as head of the Olympian gods. Construction began in the 6th century BC during the rule of the Athenian tyrants, who envisioned building the greatest temple in the ancient world, but it was not completed until the reign of Roman Emperor Hadrian in the 2nd century AD, some 638 years after the project had begun. During the Roman period, the temple, which included 104 colossal columns, was renowned as the largest temple in Greece and housed one of the largest cult statues in the ancient world.

The temple's glory was short-lived, as it fell into disuse after being pillaged during a Germanic invasion in 267 AD, just about a century after its completion. It was probably never repaired, and was reduced to ruins thereafter. In the centuries after the fall of the Roman Empire, it was extensively quarried for building materials to supply building projects elsewhere in the city. Today, a substantial part of the temple remains intact, notably 16 of the original gigantic columns, and it is now the center of a historical precinct.

Hellenism (Greek: Ἑλληνισμός) in a religious context refers to the modern pluralistic religion practiced in Greece and around the world by several communities derived from the beliefs, mythology, and rituals from antiquity through and up to today. It is a system of thought and spirituality with a shared culture and values, and common ritualistic, linguistic, and literary tradition. More broadly, Hellenism centers itself on the worship of Hellenic deities, namely the twelve Olympians.

Greeks who identify their religion and way of life with Hellenism are commonly referred to as Εθνικοί Έλληνες (Ethnic Hellenes). Non-Greek devotees of the Greek gods who embody Hellenic ideals commonly referred to Hellenists. Hellenism is sometimes referred to as a Pagan religion; this classification is also at times used as a pejorative for Greeks. Olympianismos (Olympianism) and Neopaganismos (Neopaganism) are used by the Greek Orthodox Church in a derogatory manner, while the term Dodekatheismos (religion of twelve gods) is used by both Christian critics and some polytheists.

In Greek mythology, the Titans (Ancient Greek: Τιτᾶνες, Tītânes; singular: Τιτάν, Tītā́n) were the deities that preceded the Olympians. According to the Theogony of Hesiod, they were the twelve children of the primordial deities Uranus (Sky) and Gaia (Earth). The six male Titans were Oceanus, Coeus, Crius, Hyperion, Iapetus, and Cronus, and the six female Titans (called the Titanesses; Ancient Greek: Τιτανίδες, Tītānídes; singular: Τιτανίς, Tītānís) were Theia, Rhea, Themis, Mnemosyne, Phoebe, and Tethys.

After Cronus married his sister Rhea, she bore the first generation of Olympians: the six siblings Zeus, Hera, Poseidon, Demeter, Hades, and Hestia. Certain other children of the Titans, such as Prometheus, Atlas, Helios, and Leto, are sometimes also called Titans.

The Catalogue of Women (Ancient Greek: Γυναικῶν Κατάλογος, romanized: Gunaikôn Katálogos)—also known as the Ehoiai (Ancient Greek: Ἠοῖαι, romanized: Ēoîai, Ancient: [ɛː.ôi̯.ai̯])—is a fragmentary Greek epic poem that was attributed to Hesiod during antiquity. The "women" of the title were in fact heroines, many of whom lay with gods, bearing the heroes of Greek mythology to both divine and mortal paramours. In contrast with the focus upon narrative in the Homeric Iliad and Odyssey, the Catalogue was structured around a vast system of genealogies stemming from these unions and, in M. L. West's appraisal, covered "the whole of the heroic age." Through the course of the poem's five books, these family trees were embellished with stories involving many of their members, and so the poem amounted to a compendium of heroic mythology in much the same way that the Hesiodic Theogony presents a systematic account of the Greek pantheon built upon divine genealogies.

Most scholars do not currently believe that the Catalogue should be considered the work of Hesiod, but questions about the poem's authenticity have not lessened its interest for the study of literary, social and historical topics. As a Hesiodic work that treats in depth the Homeric world of the heroes, the Catalogue offers a transition between the divine sphere of the Theogony and the terrestrial focus of the Works and Days by virtue of its subjects' status as demigods. Given the poem's concentration upon heroines in addition to heroes, it provides evidence for the roles and perceptions of women in Greek literature and society during the period of its composition and popularity. Greek aristocratic communities, the ruling elite, traced their lineages back to the heroes of epic poetry; thus the Catalogue, a veritable "map of the Hellenic world in genealogical terms," preserves much information about a complex system of kinship associations and hierarchies that continued to have political importance long after the Archaic period. Many of the myths in the Catalogue are otherwise unattested, either entirely so or in the form narrated therein, and held a special fascination for poets and scholars from the late Archaic period through the Hellenistic and Roman eras.