What is Bello Parta Cedunt Reipublicae?

Legal Definition
Things acquired In war belong or go to the state. 1 Kent, Comm. 101; 5 C. Rob. Adm. 173, 181; The Joseph, 1 Gall. 558, Fed. Cas. No. 7,533. The right to all captures vests primarily in the sovereign. A fundamental maxim of public law.
-- Black's Law Dictionary
Legal Definition
Spoils of war go to the state.
-- Ballentine's Law Dictionary