Tautvilas

Tautvilas (or Tautvila; died 1263) was Duke of Polatsk and one of the sons of Dausprungas and nephews of King of Lithuania Mindaugas. Tautvilas together with his brother Edivydas and uncle Vykintas waged a civil war against Mindaugas. The war resulted in coronation of Mindaugas.
In 1248, Mindaugas sent Tautvilas, Edivydas, and Vykintas to conquer Smolensk promising that they could keep what they would conquer. On the Protva River they defeated Duke of Moscow but lost to the Duke of Vladimir-Suzdal. After discovering about the failure, Mindaugas took their land and property for himself. At the beginning of 1249, Tautvilas, Edivydas, and Vykintas fled to Daniel of Galicia, who was married to Tautvilas' sister. They formed a powerful coalition with the Samogitians, the Livonian Order, and Vasilko of Volhynia in opposition to Mindaugas. An internal war erupted. While Daniel and the Livonian Order were organizing military campaigns into Mindaugas lands, Tautvilas travelled...