Wikipedia:
Mściwój II of Pomerania
Mściwój II (also called Mestwin II or Mszczuj II, 1220 - December 25, 1294) was Duke of Pomerelia in the years 1266-1294.
Mściwój II was the son of Świętopełk II. He became Duke of Świecie in 1266, and Gdańsk in 1271. Later, he united all the lands of Eastern Pomerania and became its sole ruler. Having no male heirs, he concluded the Treaty of Kępno in 1282. The treaty, confirmed by the Estates of the Duchy, made Duke Przemysł II his successor in all his possessions.
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