Excusator

·noun One who makes, or is authorized to make, an excuse; an Apologist.

excusator
excūsātor (excuss-), ōris, m. [excuso], one who excuses (late Lat.): deorum, Aug. Civ. D. 3, 20...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.