Anonymus Bele regis notarius or Master P. was the notary and chronicler of a Hungarian king, probably Béla III. Little is known about him, but his latinized name began with P, as he referred to himself as "P. dictus magister".
Anonymus is famous for his work Gesta Hungarorum, written in Medieval Latin around 1200. This work provides the most detailed history of the arrival of the Hungarian conquest of the Carpathian Basin. Most of his attempts to explain the origin of several Hungarian place names are unsupported by modern etymology.