IV Jagiellon gained control over the Chełmno Land as part of Royal Prussia. See also History of Poland (966–1385) References Sources External links Altes Preussenland before 1200 Catholic Encyclopedia Innocent III resolved (1207) to organize a new crusade...Instead of concentrating the forces of Christendom against the Mohammedans, the pope himself disbanded them by proclaiming (1209) a crusade against the Albigenses in the south of France, and against the Almohades of Spain (1213), the pagans of Prussia, and John Lackland of England. Konrad of Masovia sent Polish crusaders against Prussian after 1209 1180s births 1247 deaths 13th-century Polish monarchs Polish Roman Catholics Dukes of Masovia Dukes of Sieradz-Łęczyca People from the Kingdom of Prussia Christians of the Prussian Crusade