Congiarium

Of Ancient Roman containers, a congiarium, or congiary (Latin, from congius), was a vessel containing one congius, a measure of volume equal to six sextarii.

In the early times of the Roman Republic, the congius was the usual measure of oil or wine which was, on certain occasions, distributed among the people; and thus congiarium became a name for liberal donations to the people, in general, whether consisting of oil, wine, grain, or money, or other things, while donations made to the soldiers were called donativa, though they were sometimes also termed congiaria.