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Conrad I of Masovia

Konrad I
Konrad I Mazowiecki.jpg
19th century drawing by Jan Matejko
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 (Polish: Konrad I Mazowiecki) (ca. 1187/88 – 31 August 1247), from the Polish Piast dynasty, was the sixth Duke of Masovia and Kujawy from 1194 until his death as well as High Duke of Poland from 1229 to 1232 and again from 1241 to 1243.

He was the youngest son of High Duke Casimir II the Just of Poland and Helen of Znojmo, daughter of the Přemyslid duke Konrad II of Znojmo (ruler of the Znojmo Appanage in southern Moravia, part of Duchy of Bohemia). His maternal grandmother was Maria of Serbia, apparently a daughter of the pre-Nemanjić župan Uroš I of Rascia.

After his father's death in 1194, Konrad was brought up by his mother, who acted as regent of Masovia. In 1199 he received Masovia and in 1205 also the adjacent lands of Kuyavia. In 1205, he and his brother, Duke Leszek I the White of Sandomierz, had their greatest military victory at Battle of Zawichost against Prince Roman the Great of Galicia–Volhynia. The Ruthenian army was crushed and Roman was killed in battle. The Rurik princess Agafia of Rus became his wife.


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