sentences:  After several years of protracted negotiations regarding Casimir's return to Kingdom of Poland as king, Grand Duke, Goštautas and other Lithuanian noblemen raised conditions before Casimir was to reign in Poland.Grand Duke, already emancipated from Goštautas, insisted on equality of nobility of both states, that Grand Duchy of Lithuania and Kingdom of Poland remain separate states, governed by one or two rulers, guarantee of the completeness of Grand Duchy borders and his own right to return to the Grand Duchy of Lithuania at will.After issuing another privilege in 1447, Casimir becoming a King of Poland.