 Historian Gyula Városy claimed Peter originated from the Siklós branch of the "gens" (clan) Kán.He argued King Béla III referred to him as patron of the monastery of Holy Trinity near Pécs in 1183, which right of benefice later belonged to the Siklósi family, descending from the Kán kindred, in 1283 and 1303.Historians Gyula Pauler and Bálint Hóman accepted the argument.