In Ancient Greece "epigamia" (Ancient Greek: ἐπιγαμία) designated the legal right to contract a marriage. In particular it strongly regulated the right of intermarrying between different states. Traditionally, intermarriage between different states was not allowed, and only a special authorization (a decree of the popular assembly) could permit it.
Epigamia was also a way of formalizing the relationship between different nations. Typically, an epigamia agreement would allow the adoption of the nationality of the country of residence, for the spouse as well as children. For example, Athens granted epigamia to Euboa in the 5th century, a very rare case.
In 303 BCE, Seleucus I led an army to the Indus in India, where he encountered Chandragupta. The confrontation ended with a peace treaty, and "an intermarriage agreement" (epigamia), meaning either a dynastic marriage or a more general agreement for intermarriage between Indians and Greeks. Accordingly, Seleucus ceded to Chandragupta his northwestern territories as far as Arachosia and received 500 war elephants (which played a key role in the victory of Seleucus at the Battle of Ipsus):
- "The Indians occupy [in part] some of the countries situated along the Indus, which formerly belonged to the Persians: Alexander deprived the Ariani of them, and established there settlements of his own. But Seleucus Nicator gave them to Sandrocottus in consequence of a marriage contract, and received in return five hundred elephants." — Strabo 15.2.9 
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