 The Orthodox Bulgarians settled all around the Principality of Wallachia; however, many of them gradually lost their Bulgarian identity and became Romanianized.Catholics primarily migrated to the Austrian-ruled Banat and Transylvania, establishing still-extant communities in modern Timiș County and Arad County; some former Paulicians also settled around Bucharest, in Cioplea and Popeşti-Leordeni.The Transylvanian city of Braşov ("Kronstadt") grew into an international merchant centre attracting Bulgarian merchants ever since the 14th century (it was given trade rights in Bulgaria by Bulgarian tsar Ivan Sratsimir's "Braşov Charter" of 1369–1380) and rivalled Constantinople and Thessaloniki in importance, particularly for the people from northern Bulgaria, with many Bulgarian merchants opening offices and shops in the city.