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 Castle in Braşov County (14th century), the Hunyad Castle in Hunedoara (15th century). Notable writers such as Emil Cioran, Lucian Blaga, George Coșbuc, Octavian Goga and Liviu Rebreanu were born in Transylvania. The latter wrote the novel "Ion", which introduces the reader to a depiction of the life of the peasants and intellectuals of Transylvania at the turn of the 20th century. Transylvania has a very rich and unique religious history from the other regions of Europe. Since the Protestant Reformation, different Christian denominations coexist in this religious melting pot, including Romanian Orthodox, Romanian Greek Catholic, other Eastern Orthodox, Roman