(1105-1159), Polonya dükü (1138-1146), Bolesfavv III’ ün en büyük oğlu. Büyük oğul haklarını savunmak için kardeşlerine karşı mücadele etmek zorunda kaldı; Friedrich Bar- barossa’nın kendisini desteklemesine rağmen, BolesleM IV tarafından iktidardan uzaklaştırıldı (1146).
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