The eupátridas (in Greek old, εὐπατρίδαι, eupatrídai, "the well-born ones" or "of good parents") is the term that designates to the aristocracy or old nobility of the Greek region of Attica.

The tradition attributes its creation to Theseus, as a result of the reorganization that in the region meant the process of synecism (union) promoted by himself around the city of Athens as the political center of the region. The Eupatridae enjoyed exclusive political and religious rights that they retained after the fall of the Athenian monarchy, in the exercise of a social supremacy linked to the possession of the land. They thus represented the first phase of the process of political and administrative development of the Athenian polis, which, socially, began with the division of the population into three classes: eupátridas, demiurgos (demiurgoi) and geomoros (geomoroi). According to Plutarch, Theseus would have assigned to the eupatrids the political, legal and religious functions, the demiurges were the artisans and merchants and the geomors were the rest.

The lexicographers mention as characteristics of the eupatrids that are the native population, the inhabitants of the city, the descendants of the royal lineage. It is probable that after the time of the sinecismo, the nobles that had governed until that moment the diverse independent communities, were forced to reside in Athens, now soothes of the government, forming a social class that monopolized the political privileges. It is possible that in the early days the eupatrics were the only full citizens of Athens, since only they belonged to the phratries, and the division into phratries must have covered all citizenship. In fact, it is possible that the term originally could have designated a member of a clan, since belonging to a phratry was a characteristic of each clan. It is not likely that all eupatric families were autochthonous, even in the broad sense of the term. Some would have emigrated to Attica when the others had been there for a long time. Traces of the union of these immigrants with the oldest inhabitants have been detected when the mixture of Zeus Herkeios with Apollo Patros is seen as the ancient gods of the fraternity.

The codification of the laws in 621 a. C., attributed to Draco, is a first step towards a written constitution, since until then the laws were oral and traditional, and were subject to the interpretation of the powerful. The reforms of Solon, in 594 a. C., they took away their power over politics, associating power not to birth, but to wealth. However, the Eupatridae retained their religious power and influence, giving numerous statesmen to Athens, among them Pericles, who belonged to the Alcmaeonid family for his mother, and the Bouzigas for his father.

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