Duke of Masovia
1187 CE to 1247 CE
Konrad I of Masovia (Polish: Konrad I Mazowiecki) (1187?
– 1247), from the Polish Piast dynasty, is the sixth Duke of Masovia from 1194 until his death as well as High Duke of Poland from 1229 to 1232 and again from 1241 to 1243.
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