a fixed proportion of the booty won in war, usually a tithe (dekate), was taken out for the god before the distribution of the spoils began: this tribute is also called akrothinia, the topmost of the pile.
Burkert establishes that booty in Greek religion is never purely secular: a consecrated portion (the tithe or akrothinia) is ritually extracted for the deity prior to any human distribution, binding martial acquisition to sacrificial obligation.
, Greek Religion: Archaic and Classical, 1977thesis