 The last two princes descended from the dynasty of Rurik, Andrew of Galicia and Lev II of Galicia, were killed in battle.The allies decided to help the closest relative of the late princes – Bolesław George, the son of Trojden, Duke of Mazovia – in mastering the local throne.This effort led to increased Polish influence in Russia, which enabled the eventual takeover of the region by Wladyslaw's son and successor, Casimir III the Great.