GUILLEMUS (1237-1296), one of the most learned lawyers of the thirteenth century, was born at Puyrmoisson, 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 in 1286 was raised to the see of Mende. His works are, 1. Speculatio Juris, Rome, 1474, folio, whence he derived the name of Speculator; 2. Rationale Dicinorum Officiorum, Mentz, 1459, folio, scarce; 3. Repertorium Juris, Venice, 1496, folio.