 Complete the following phrase:  Vytautas began his reign as the Grand Duke. It is not entirely known what powers were given to him by Jogaila, but he had considerable independence. He replaced some of Jogailas brothers and supporters with trusted viceroys appointed from Lithuanian nobles: Skirgaila was removed from Polotsk, Švitrigaila from Vitebsk, Kaributas from Severian Novgorod, Vladimir from Kiev, Fyodor Koriatovych from Podolia, and Fyodor Lubartovich from Volhynia. He also made territorial secession in 1398 without approval from Jogaila. While Skirgaila always signed documents first in the name of Jogaila and only then in his own name, Vytautas used only his own name. Lithuania was drifting away from Poland, but the defeat of Vytautas army in the 