 The foundation of the see around 1020 is ascribed by the historian György Pray to King Stephen I of Hungary; the seat of the diocese, however, was then Byhor (Bihar), whence it was transferred by King Ladislaus I of Hungary to Várad (Oradea) in 1077.The statutes of the chapter of 1370 explicitly attribute the founding of the see to King Ladislaus.The patron of the diocese is Ladislaus.