1300: Teutonic Order moves its headquarter from Venice to Marienburg at the Vistula. 1303-07: Serbian rebellion under Stepan Hrebeljanovic. At the end, Hungary has to give them independence. The new Serbia under czar Stepan also includes Bosnia. 1315: Teutonic Order decides to invade Russia. 1319: Young Serbia clashes with the Rum-Seljuks in Macedonia, but is defeated. 1320s: In Novgorod, the ushkuiniki (Russian river pirates) don't come into existence, since the stronger Vladimir-Suzdal is too deterring. Instead, the Novgorodians will start to explore Siberia, starting with the Ob river.