An epikleros (ἐπίκληρος; pl.: epikleroi) was an heiress in ancient Athens and other ancient Greek city states, specifically a daughter of a man who had no sons. In Sparta, they were called patrouchoi (πατροῦχοι), as they were in Gortyn. Athenian women were not allowed to hold property in their own name; in order to keep her father's property in the family, an epikleros was required to marry her father's nearest male relative. Even if a woman was already married, evidence suggests that she was required to divorce her spouse to marry that relative. Spartan women were allowed to hold property in their own right, and so Spartan heiresses were subject to less restrictive rules. Evidence from other city-states is more fragmentary, mainly coming from the city-states of Gortyn and Rhegium.
Plato wrote about epikleroi in his Laws, offering idealized laws to govern their marriages. In mythology and history, a number of Greek women appear to have been epikleroi, including Agariste of Sicyon and Agiatis, the widow of the Spartan king Agis IV. The status of epikleroi has often been used to explain the numbers of sons-in-law who inherited from their fathers-in-law in Greek mythology. The Third Sacred War originated in a dispute over epikleroi.