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
Celts in Transylvania The Dacian war trumpet, as shown on the Roman Emperor Trajan's Column at Rome 116 AD, is a Celtic-style carnyx. High-relief ornamental designs known as the "Plastic Style" are found on warriors' equipment from Pişcolt, comprising a shield with an ornate handle and shield-boss as well as a sword in an ornamented scabbard with traces of a "dragon-pair" motif. This motif is one of the genuinely pan-European themes of early La Tène art and is found embellishing the upper end of scabbard front-plates from southeast Britain to Transylvania. From at least the 3rd century BC, the undoubted interaction between the