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Bolesław II the Horned (), known also as Bolesław II the Bald () (c. 1220/5 – 26/31 December 1278), a member of the Silesian Piasts, was High Duke of Poland briefly in 1241 and Duke of Silesia at Wrocław from 1241 until 1248, when the duchy was divided between him and his brothers. After the partition, he ruled the Silesian Duchy of Legnica until his death. The second Mongol raid against Poland, led by Nogai Khan, occurred during his reign.