 Other states, like the Duchy of Prussia (1525) and the Landgraviate of Hesse (1526), preceded the official establishment of it in Saxony (1527).Meanwhile, in the "Albertine" lands Duke Albert's son, George (1500–39), founder of the Catholic League of Dessau, was a strong opponent of the Lutheran doctrine and had repeatedly sought to influence his "Ernestine" cousins in favour of the Catholic Church.However, George's brother and successor, Duke Henry IV of Saxony (1539–41), was finally won over to Protestantism under the influence of his wife, Catherine of Mecklenburg, and thus the Catholic diocese of Meissen came to be abolished.