Henryk IV of Poland

Henryk IV (Henryk IV; Heinrich IV.) (23 January 1256 – 19 May 1324) was High Duke of the Polish from 7 December 1272 and the Duke of Silesia-Wrocław from 1266 until his death. His reign of 52 years on the Polish throne was one of the longest monarchs in the 12th and 13th century.