Alcmaeonidae in the context of "Alcibiades"

Cleisthenes (/ˈklaɪsθɪniːz/ KLYS-thin-eez; Ancient Greek: Κλεισθένης), or Clisthenes (c. 570 – c. 508 BC), was an ancient Athenian lawgiver credited with reforming the constitution of ancient Athens and setting it on a democratic footing in 508 BC. For these accomplishments, historians refer to him as "the father of Athenian democracy". He was a member of the aristocratic Alcmaeonid clan. He was the younger son of Megacles and Agariste making him the maternal grandson of the tyrant Cleisthenes of Sicyon. He was also credited with increasing the power of the Athenian citizens' assembly and for reducing the power of the nobility over Athenian politics.

In 510 BC, Spartan troops helped the Athenians overthrow the tyrant Hippias, son of Peisistratus. Cleomenes I, king of Sparta, put in place a pro-Spartan oligarchy headed by Isagoras. However, Cleisthenes, with the support of the middle class and aided by democrats, took over. Cleomenes intervened in 508 and 506 BC, but could not stop Cleisthenes and his Athenian supporters. Through Cleisthenes' reforms, the people of Athens endowed their city with isonomic institutions—equal rights for all citizens (though only free men and women were citizens)—and established ostracism as a punishment.

Pericles (/ˈpɛrɪkliːz/ ; Ancient Greek: Περικλῆς; c. 495–429 BC) was a Greek statesman and general during the Golden Age of Athens. He was prominent and influential in Ancient Athenian politics, particularly between the Greco-Persian Wars and the Peloponnesian War, and was acclaimed by Thucydides, a contemporary historian, as "the first citizen of Athens". Pericles turned the Delian League into an Athenian empire and led his countrymen during the first two years of the Peloponnesian War. The period during which he led Athens as its preeminent orator and statesman, roughly from 461 to 429 BC, is sometimes known as the "Age of Pericles", but the period thus denoted can include times as early as the Persian Wars or as late as the following century.

Pericles promoted the arts and literature, and it was principally through his efforts that Athens acquired the reputation of being the educational and cultural center of the ancient Greek world. He started an ambitious project that generated most of the surviving structures on the Acropolis, including the Parthenon. This project beautified and protected the city, exhibited its glory, and gave work to its people. Pericles also fostered Athenian democracy to such an extent that critics called him a populist. Pericles was descended, through his mother, from the powerful and historically influential Alcmaeonid family. He, along with several members of his family, succumbed to the Plague of Athens in 429 BC, which weakened the city-state during a protracted conflict with Sparta.

Neleides or Nelides (/ˈniːliɪdz/ NEEL-ee-idz; Ancient Greek: Nηλείδης; also Neleiades, Νηληιάδης, and Neleius), in the plural Neleidae (Ancient Greek: Νηλεῖδαι), was a patronymic of ancient Greece derived from Neleus, son of the Greek god Poseidon, and was used to refer to his descendants. In literature, this name typically designated either Nestor, the son of Neleus, or Antilochus, his grandson. One notable offshoot of this family line was the Alcmaeonidae.

Callias (Greek: Kαλλίας, known as Callias III to distinguish him from his grandfather and great-great-grandfather) was an ancient Athenian aristocrat and political figure. He was the son of Hipponicus and an unnamed woman (she later married Pericles), an Alcmaeonid and the third member of one of the most distinguished Athenian families to bear the name of Callias. He was regarded as infamous for his extravagance and profligacy.

He apparently inherited his family's fortune in 424 BC. In 371 BC, he was one of the Athenian envoys sent to Sparta to negotiate peace. He is said to have spent his family's enormous wealth on sophists, flatterers, and women, and to have died in poverty. He is a character in several Socratic dialogues: Plato's Protagoras and Xenophon's Symposium are set at his house, and he featured in Aeschines of Sphettus's lost Aspasia.

Cleisthenes (/ˈklaɪsθɪniːz/ KLYS-thin-eez; Greek: Κλεισθένης), or Clisthenes (c. 570 – c. 508 BC), was an ancient Athenian lawgiver credited with reforming the constitution of ancient Athens and setting it on a democratic footing in 508 BC. For these accomplishments, historians refer to him as "the father of Athenian democracy". He was a member of the aristocratic Alcmaeonid clan. He was the younger son of Megacles and Agariste making him the maternal grandson of the tyrant Cleisthenes of Sicyon. He was also credited with increasing the power of the Athenian citizens' assembly and for reducing the power of the nobility over Athenian politics.

In 510 BC, Spartan troops helped the Athenians overthrow the tyrant Hippias, son of Peisistratus. Cleomenes I, king of Sparta, put in place a pro-Spartan oligarchy headed by Isagoras. However, Cleisthenes, with the support of the middle class and aided by democrats, took over. Cleomenes intervened in 508 and 506 BC, but could not stop Cleisthenes and his Athenian supporters. Through Cleisthenes' reforms, the people of Athens endowed their city with isonomic institutions—equal rights for all citizens (though only free men and women were citizens)—and established ostracism as a punishment.

Xanthippus (/zænˈθɪpəs/; Greek: Ξάνθιππος, pronounced [ksán.tʰip.pos]; c. 520 – 475 BC) was a wealthy Athenian politician and general during the Greco-Persian Wars. He was the son of Ariphron and father of Pericles, both prominent Athenian statesmen. A marriage to Agariste, niece of Cleisthenes, linked Xanthippus with the Alcmaeonid clan, whose aristocratic interests he often represented in government. He was ostracized in 484 BC, likely arising from his rivalry with Themistocles, but he was recalled from exile when the Persians invaded Greece. He commanded the Athenian fleets in the Battle of Mycale and the Siege of Sestos. It is possible that he participated in the Battle of Marathon and Battle of Salamis.