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
1537 Transylvania the Austro-Hungarian Empire. Transylvania is also the birthplace of the discoverer Gyula Strommer (1920–1995). "Transylvania" was his only minor-planet discovery. The official naming citation was published by the Minor Planet Center on 1 February 1980 (). 1537 Transylvania 1537 Transylvania, provisional designation , is a carbonaceous asteroid and long-lost minor planet from the outer regions of the asteroid belt, approximately 17 kilometers in diameter. Discovered by Gyula Strommer in 1940, it was later named after region of Transylvania, where the discoverer was born. "Transylvania" was discovered on 27 August 1940, by Hungarian astronomer Gyula Strommer at the Konkoly Observatory near