Вацлав IV
Vytautas had been frustrated by Jogaila's Polish arrangements and rejected the prospect of Lithuania's subordination to Poland. Under Vytautas, a considerable centralization of the state took place, and the Catholicized Lithuanian nobility became increasingly prominent in state politics. The centralization efforts began in 1393–1395, when Vytautas appropriated their provinces from several powerful regional dukes in Ruthenia. Several invasions of Lithuania by the Teutonic Knights occurred between 1392 and 1394, but they were repelled with the help of Polish forces. Afterwards, the Knights abandoned their goal of conquest of Lithuania proper and concentrated on subjugating and keeping Samogitia. In 1395, Wenceslaus IV of Bohemia, the Order's formal superior, prohibited the Knights from raiding Lithuania.