When did the cousin of the Grand Duke of Lithuania die?
Vytautas Vytautas (c. 1350 – October 27, 1430), also known as Vytautas the Great (Lithuanian: "   ", Belarusian: "Вітаўт Кейстутавіч (Vitaŭt Kiejstutavič)" , Polish: "Witold Kiejstutowicz" , Rusyn: "Vitovt", Latin: "Alexander Vitoldus") from the 15th century onwards, was a ruler of the Grand Duchy of Lithuania, which chiefly encompassed the Lithuanians and Ruthenians. He was also the Prince of Hrodna (1370–1382), Prince of Lutsk (1387~1389), and the postulated king of the Hussites.
George, Duke of Mecklenburg George, Duke of Mecklenburg (German: "Georg Herzog zu Mecklenburg" ; 5 October [O.S. 22 September] 1899 – 6 July 1963) was the head of the House of Mecklenburg-Strelitz from 1934 until his death. Through his father, he was a direct descendant (great-great-grandson) of Russian Emperor Paul I.