WILLIAM, one of the most learned lawyers of the thirteenth century, was born at Puimoisson, in Provence. He was a pupil of Henry of Susa, and taught canon law at Modena. He was afterwards made chaplain and auditor of the sacred palace, legate of Gregory X. at the council of Lyons, and bishop of Mende in 1286. His works are, 1. Speculum Juris, Rome, 1474, folio, whence he derived the name of Speculator; 2. Ratione Divinorum Officiorum, Mentz, 1459, folio, scarce; 3. Repertorium Juris, Venice, 1496, folio.