The Kingdom of Hungary collapsed, and the Ottomans occupied parts of Banat and Crișana in 1541. Transylvania and Maramureș, along with the rest of Banat and Crișana developed into a new state under Ottoman suzerainty, the Principality of Transylvania. Reformation spread and four denominations—Calvinism, Lutheranism, Unitarianism, and Roman Catholicism—were officially acknowledged in 1568. The Romanians' Orthodox faith remained only tolerated, although they made up more than one-third of the population, according to 17th-century estimations.