Transylvania as originally defined in Treaty of Trianon, 27 years earlier, thus confirming the return of Northern Transylvania to Romania. From 1947 to 1989, Transylvania, along with the rest of Romania, was under a communist regime. The ethnic clashes of Târgu Mureș occurred between ethnic Romanians and Hungarians in March 1990 after the fall of the communist regime and became most notable inter-ethnic incident in the post-communist era. The Transylvanian Plateau, high, is drained by the Mureș, Someș, Criș, and Olt rivers, as well as other tributaries of the Danube. This core of historical Transylvania roughly corresponds with nine counties of
Transylvania such, there are significant numbers of inhabitants of Transylvania that follow Roman Catholicism, Greek Catholicism and Protestantism. There are also small denominations like adventism, Jehovah's Witnesses and more. Others "Data refers to extended Transylvania (with Banat, Crișana and Maramureș)." The first heraldic representations of Transylvania date from the 16th century. One of the predominant early symbols of Transylvania was the coat of arms of Sibiu city. In 1596 Levinus Hulsius created a coat of arms for the imperial province of Transylvania, consisting of a shield party per fess, with a rising eagle in the upper field and seven hills with