Stephen I, the first crowned king of Hungary whose reign began in 1000 or 1001, unified the Carpathian Basin. Around 1003, he launched a campaign against "his maternal uncle, King Gyula" and occupied Transylvania. Stephen I later turned against Ahtum, "who had been baptised in the Orthodox faith in Vidin", and conquered Banat. Hartvik, Stephen I's hagiographer, wrote that the monarch "divided his territories in ten bishoprics". In the territory of modern Romania, three Roman Catholic dioceses were established with their seats in Alba Iulia, Biharea (from the last decades of the 11th century in Oradea), and Cenad.