What is Bancus?

Legal Definition
L. Lat. In old English law and practico. A bench or scat in the king's hall or palace. Fleta, lib. 2, c. 16, § 1. A high seat, or seat of distinction; a seat of judgment, or tribunal for the administration of justice. The English court of common picas was formerly called "Bancus." A sitting in home; the sittings of a court with its full judicial authority, or in full form, as distinguished from sittings at nisi prius. A stall, bench, table, or counter, on which goods were exposed for sale, Cowell.
See also
-- Black's Law Dictionary
Legal Definition
Banc.
-- Ballentine's Law Dictionary