What is Beneficium?

Legal Definition
In early feudal law. A benefice; a permanent stipendiary estate; the same with what was afterwards called a "fief," "feud," or "fee." 3 Steph. Comm. 77, note i; Spelman. In the civil law. A benefit or favor; any particular privilege. Dig. 1, 4, 3; Cod. 7, 71; Mackeld. Rom. Law, § 196. A general term applied to ecclesiastical llvings. 4 Bl. Coram. 107; Cowell.
See also
-- Black's Law Dictionary
Legal Definition
A benefice.
-- Ballentine's Law Dictionary