 Maria Theresa and Joseph II, in regulations issued in 1761, 1767 and 1783, outlawed the Romani nomadic lifestyle, forced them to accept local clothing codes and languages, made regulations regarding personal and family names and limited their choice of professions.Large groups of Roma arrived in Croatia in the 19th century from Romania after the abolition of Romani slavery there in 1855.About 20,000 Croatian Romani were executed by Ustasha police officers during World War II.