Treaty of Dovydiškės

The Treaty of Dovydiškės (Lithuanian: Dovydiškių sutartis; German: Vertrag von Daudisken), Daudiske, or Daudisken was a secret treaty signed on 31 May 1380 between Jogaila, the Grand Duke of Lithuania, and Winrich von Kniprode, the Grand Master of the Teutonic Knights. The treaty was directed against Jogaila's uncle Kęstutis and its effect was to precipitate the Lithuanian Civil War (1381–1384).