invaded Pomerelia, whose princeps Mestwin I became his vassal. The Danish suzerainty did not last long, however. Mestwin had already gained more independence from Poland and expanded southward, and his son Swietopelk II, who succeeded him in 1217, gained full independence in 1227.

Duchy of Pomerelia

After Mestwin I's death, Pomerelia was internally divided among his sons Swietopelk II, Wartislaw,

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