The term Vlachs was initially used in medieval Croatian and Venetian history for a Romance-speaking pastoralist community, called "Vlachs" and "Morlachs", inhabiting the mountains and lands of the Croatian Kingdom and the Republic of Venice (Venetian Dalmatia) from the early 14th century. By the end of the 15th century they were highly assimilated with the Slavs and Croats and lost their language or were at least bilingual, while some communities managed to preserve and continue to speak their language (Istro-Romanians).