Agiad dynasty in the context of "Demaratus"

Cleomenes I (/kliːˈɒmɪniːz/; Greek Κλεομένης; died c. 490 BC) was Agiad King of Sparta from c. 524 to c. 490 BC. One of the most important Spartan kings, Cleomenes was instrumental in organising the Greek resistance against the Persian Empire of Darius, as well as shaping the geopolitical balance of Classical Greece.

The Heracleidae (/hɛrəˈklaɪdiː/; Ancient Greek: Ἡρακλεῖδαι) or Heraclids /ˈhɛrəklɪdz/ were the numerous descendants of Heracles, especially applied in a narrower sense to the descendants of Hyllus, the eldest of his four sons by Deianira (Hyllus was also sometimes thought of as Heracles' son by Melite). Other Heracleidae included Macaria, Lamos, Manto, Bianor, Tlepolemus, and Telephus. These Heraclids were a group of Dorian kings who conquered the Peloponnesian kingdoms of Mycenae, Sparta and Argos; according to the literary tradition in Greek mythology, they claimed a right to rule through their ancestor. Since Karl Otfried Müller's Die Dorier (1830, English translation 1839), I. ch. 3, their rise to dominance has been associated with a "Dorian invasion". Though details of genealogy differ from one ancient author to another, the cultural significance of the mythic theme, that the descendants of Heracles, exiled after his death, returned some generations later to reclaim land that their ancestors had held in Mycenaean Greece, was to assert the primal legitimacy of a traditional ruling clan that traced its origin, thus its legitimacy, to Heracles.

In the historical period, several dynasties claimed descent from Heracles, such as the Agiads and Eurypontids of Sparta, or the Temenids of Macedonia. In modern times, the same lineage has been claimed by the House of Burgundy and the kings of Castile.

Leonidas I (/liəˈnaɪdəs, -dæs/; Ancient Greek: Λεωνίδας, Leōnídas; born c. 540 BC; died 11 August 480 BC) was king of the Ancient Greek city-state of Sparta. He was the son of king Anaxandridas II and the 17th king of the Agiad dynasty, a Spartan royal house which claimed descent from Heracles. Leonidas I ascended to the throne in c. 489 BC, succeeding his half-brother king Cleomenes I. He ruled jointly along with king Leotychidas II until his death in 480 BC, when he was succeeded by his son, Pleistarchus.

At the Second Greco-Persian War, Leonidas led the allied Greek forces in a last stand at the Battle of Thermopylae (480 BC), attempting to defend the pass from the invading Persian army, and was killed early during the third and last day of the battle. Leonidas entered myth as a hero and the leader of the 300 Spartans who died in battle at Thermopylae. While the Greeks lost this battle, they were able to expel the Persian invaders in the following year.

For most of its history, the ancient Greek city-state of Sparta in the Peloponnese was ruled by kings. Sparta was unusual among the Greek city-states in that it maintained its kingship past the Archaic age. It was even more unusual in that it had two kings simultaneously, who were called the archagetai, coming from two separate lines. According to tradition, the two lines, the Agiads (Ἀγιάδαι, Agiadai) and Eurypontids (Εὐρυποντίδαι, Eurypontidai), were respectively descended from the twins Eurysthenes and Procles, the descendants of Heracles, who supposedly conquered Sparta two generations after the Trojan War. The dynasties themselves, however, were named after the twins' grandsons, the kings Agis I and Eurypon, respectively. The Agiad line was regarded as being senior to the Eurypontid line.

Although there are lists of earlier purported kings of Sparta, there is little evidence for the existence of any before the mid-sixth century BC.

Nicomedes (fl. 460 – 457 BC) was a Spartan military commander and a scion of the royal Agiad dynasty. He was a regent of Sparta during the minority of Pleistoanax, the son of his brother Pausanias.