History of Transylvania union of Transylvania with Romania in Alba Iulia on 1. December 1918.; Bessarabia, having declared independence from Russia in 1917 at the Conference of the Country (Sfatul Țării), called in Romanian troops to protect the province from the Bolsheviks. The union of the Transylvania, Maramureș, Crișana and Banat regions with the Old Kingdom of Romania was ratified in 1920 by the Treaty of Trianon, which recognised the sovereignty of Romania over these regions and settled the border between the Republic of Hungary and the Kingdom of Romania. The union of Bukovina and Bessarabia with Romania was ratified in 1920 by
Principality of Transylvania (1570–1711) the last political triumph of Hungarian Protestantism, in which the emperor was forced to confirm again the articles of the Peace of Vienna. Gabriel Bethlen and George I Rákóczi also did much for education and culture, and their era has justly been called the golden era of Transylvania. They lavished money on the embellishment of their capital Alba Iulia, which became the main bulwark of Protestantism in Eastern Europe. During their reign Transylvania was also one of the few European countries where Roman Catholics, Calvinists, Lutherans, and Unitarians lived in mutual tolerance, all of them belonging to the officially accepted