Konrad I of Masovia

Konrad I
Konrad's effigy on a seal
High Duke of Poland
Reign	1229–1232
Predecessor	Władysław III Spindleshanks
Successor	Henry I the Bearded
Reign	1241–1243
Predecessor	Bolesław II Rogatka
Successor	Bolesław V the Chaste
Duke of Masovia
Reign	1194–1247
Predecessor	Casimir II the Just Helen of Znojmo (regent)
Successor	Boleslaus I
Born	c. 1187/88
Died	31 August 1247
Spouse	Agafia of Rus
Issue	Boleslaus I of Masovia Casimir I of Kuyavia Siemowit I of Masovia
House	House of Piast
Father	Casimir II the Just
Mother	Helen of Znojmo

Konrad I of Masovia (ca. 1187/88^[1] – 31 August 1247), from the Polish Piast dynasty, was the sixth Duke of Masovia and Kuyavia from 1194 until his death as well as High Duke of Poland from 1229 to 1232 and again from 1241 to 1243.