During the rule of Béla IV, the Catholic hierarchy was disestablished by the Mongol incursion ("see Battle of Mohi"), and only recovered after 1300. In 1304, Pope Boniface VIII sent the first Catholic missionaries from Transylvania into the lands over the Carpathian Mountains (the area known as "Cumania"), where Eastern Orthodox bishops were already present. A "Diocese of Cumania" was created on the Milcov, in areas later ruled by Moldavia and Wallachia. Its assets were granted by the Hungarian rulers, whose claimed suzerainty over the region, and it extended over parts of Székely Land.