|Historical era||Middle Ages|
Yotvingia (Polish: Jaćwież, Lithuanian: Jotva, Belarusian: Етвязь, old Russian: Ятвягия) was a region where the Baltic tribe known as Yotvingians lived. It was located in the area of Sudovia and Dainava; south west from the upper Neman, between Marijampolė, Merkinė (Lithuania), Slonim, Kobryn (Belarus), Białystok, and Ełk (Poland);
The Treaty of 944 between Kievan prince Igor and the Byzantine Empire has the names of many Rus' ambassadors - one of which was Jatviag Gunarev. It is also the first written documentation of the term Jatviag, or Yatviag.
When his father died in 1170, Roman the Great was bequeathed the Principality of Vladimir-in-Volhynia. He subdued the Yatvingians, and harnessed the captives instead of oxen to drag the plows on his estates.
In 1264, the Duke of Krakow, Boleslaw V the Chaste organized an expedition against Yotvingia. On 23 June 1264 the two armies met near Brańsk. The Battle of Brańsk lasted two days pitting the forces of Yotvingia, led by Komata (Kumata) against the well equipped Krakovian army. The Yotvingian forces were routed in a bloody battle and Komata was killed.
- Roman Senkus (Managing Editor) (2001-XX-YY). "Roman Mstyslavych [Mstyslavyč] (Romanko)". Encyclopedia of Ukraine. Canadian Institute of Ukrainian Studies. Retrieved 2009-12-26.
- Vernadsky, George. Kievan Russia.
- Map showing "Jadzvings" (Yotvingians) on the eastern edge of Poland "at the time of the death of Boleslav the Wrymouthed 1138."
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