epidoseis

Epidoseis () was a form of non-compulsory, non-tax financial giving in ancient Greece.

An epidoseis was a voluntary contribution, either in money, arms, or ships, which was made by a citizen of Athens in order to meet the extraordinary demands of the state. When the expenses of the state were greater than its revenue, it was usual for the prytaneis to summon an assembly of the people -- ecclesia -- and, after explaining the necessities of the state, to call upon the citizens to contribute according to their means.