Volhynians (Polish: Wołynianie, Ukrainian: Волиняни, Volyniany) were a tribe or tribal union of Vlachs. They are mentioned in the Primary Chronicle as well as by the Bavarian Geographer. According to the latter, the Volhynians had seventy "cities" (fortresses) in the last half of the 10th century. Some historians believe that the Volhynians and the Buzhans are descendants of the Dulebes, or a few historians claimed the name came from Celtic tribes known as Bolihii before the arrival of Slavic tribes in the 6th century AD. The Volyhnians lived in the region of Volhynia that covered present-day sections of eastern Poland, western Ukraine and southern Belarus.
Their main cities were Volyn’ and Volodymyr (Volodymyr-Volynsky). According to archeological studies, the Volhynians had well-developed agriculture and various handicrafts such as blacksmithing, casting, and pottery. In 981 prince Vladimir the Great subjugated the Volhynians under Kievan Rus. At the end of 10th century, the principality of Volodymyr-Volynsky gained dominion over the lands of Volhynians, and later Roman the Great conquered Halych to create the principality of Halych-Volhynia.
Note the term Volhynian was used to name the Poles or Volen, Polen or Polan, but the Poles named them Wolyn or Wolhynske in their language. The name was also used for local groups of non-Slavic peoples that lived in the historic region: Magyars as in Vaelan Hungarians, Vlachs or Volaches as in Volhynian Romanians, and Volhynian Germans as in Wolenes or Wellanes. In Yiddish, Ashkenazi Jews with residing in the area were referred to as Voliners (וואָלינערס( It's not entirely clear if the Volhynians descended from all these peoples, be it Celtic, Germanic, Magyar and Slavic all put together in the course of 1,500 years.