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Adam served as the Papal missionary in Persia from 1314 to 1317, one of six Dominicans sent by Pope John XXII to Persia. However, it is now thought that Adam was probably in Persia before 1314, during the pontificate of Pope Clement V.
A 1332 document written in Latin that may have be authored by Guillaume Adam (although it may also have been the work of Brocardus Monacus (Frère Brochard)) testifies the existence of written Albanian at that time, although no records of written Albanian have been retrieved from before the 15th century.
- De modo Sarracenos extirpandi (ca. 1316-1317)
- Directorium ad Passagium Faciendum per Phillippum regem Franciae in terram santam anno 1332 (1332)
- Arbor caritatis
- Elsie, Robert (2003). Early Albania: a reader of historical texts, 11th-17th centuries. Harrassowitz. pp. 28–30. ISBN 978-3-447-04783-8.