Question: Butautas attempted to depose the uncle who ruled the Lithuanians during what period?
Related documents: [0]  [DOC] Algirdas (Belarusian: Альгерд , Russian: Ольгерд , Polish: "Olgierd" ;  1296  – May 1377) was a ruler of medieval Lithuania. He ruled the Lithuanians and Ruthenians from 1345 to 1377. With the help of his brother Kęstutis (who defended the western border of the Duchy) he created an empire stretching from the present Baltic states to the Black Sea and to within fifty miles of Moscow. [END] 
[1]  [DOC] Butautas (baptized "Henryk"; died on May 7, 1380 in Prague) was a son of Kęstutis, Grand Duke of Lithuania. He attempted to depose his uncle Algirdas and usurp power in Lithuania, but failed and was forced into exile. He joined the court of the Holy Roman Emperor and even inspired a poem about conversion to Christianity. Butautas is sometimes confused with his brother Vaidotas. [END] 
Answer: 
1345 to 1377
1345 to 1377