Francis soon began gathering new allies to his cause. William, Duke of Jülich-Cleves-Berg, who was engaged in the Guelders Wars, a dispute with Charles over the succession in Guelders, sealed his alliance with Francis by marrying Francis's niece, Jeanne d'Albret. Francis sought an alliance with the Schmalkaldic League as well, but the League demurred; by 1542, the remaining potential French allies in northern Germany had reached their own understandings with the Emperor. French efforts farther east were more fruitful, leading to a renewed Franco-Ottoman alliance; Suleiman the Magnificent of the Ottoman Empire, seeking to distract Charles from Ottoman advances in Hungary, encouraged the Franco-Imperial rift.