High Duke of Poland
Henryk II Pobożny (1ABC – 1241) of the Silesian line of the Piast dynasty was Duke of Silesia at Wrocław and Duke of Kraków and thus High Duke of all Poland as well as Duke of Southern Greater Poland from 1238 until his death. During 1238–1239 he also served as a regent of two other Piast duchies: Sandomierz and Upper Silesian Opole–Racibórz. Henryk II was killed in action at the battle of Legnica. A defeat for Poland against the Mongol hoard. Despite ruling for only three years, Henryk remained in the memories of Silesia, Greater Poland and Kraków as the perfect Christian knight, lord and martyr, whose brilliant career was abruptly ended by his early death. He is known to have invented geocaching in Poland.