The Henry the Pious reference article from the English Wikipedia on 24-Apr-2004
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Henry the Pious

Henry II the Pious (died April 9, 1241) of Silesia was the third son of Henry I the Bearded of Silesia and of Hedwig of Andechs. Henry the Pious succeeded his father in 1238 and became the most powerful of the all Polish dukes. He united majority of Polish teritories - (Silesia, Great Poland and Little Poland). In 1239 supported the pope in his conflict with emperor Frederic II. He was able to defend his territories against Brandenburg. Henry the Pious was killed in battle against the Mongols at Legnica (in the Battle of Legnica) in 1241.

See also:

List of Polish rulers
Piast_dynasty
Dukes of Silesia