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Konrad II of Czersk (pl: Konrad II czerski; c. 1250 – 24 June/21 October 1294), was a Polish prince member of the House of Piast, Duke of Masovia during 1264-1275 jointly with his brother, after 1275 sole ruler over Czersk and Duke of Sandomierz during 1289.
Among the Piast Dukes of Masovia, Bolesław's IV nephew Konrad I was Polish high duke from 1229 to 1232 and again from 1241 to 1243; he was the ruler who in 1226 called the Teutonic Order for help against the pagan Old Prussians threatening the northern borders of his territory.
Konrad I of Masovia (ca. 1187/88 – 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.
Conrado I de Mazovia (1187 o 1188-31 de agosto de 1247), de la dinastía Piast, fue duque de la provincia de Mazovia y gran duque de toda Polonia (1229-1232). Vida. Conrado fue el hijo menor del Gran Duque Casimiro II el Justo y de Helena de Znojmo, hija del duque přemyslida Conrado II de Znojmo.
26 de jul. de 2023 · Konrad I of Masovia (Polish: Konrad I Mazowiecki; 1187? – 1247), son of Casimir II and Helen of Moravia, was the 6th Duke of Masovia. After his father's death in 1194, Konrad was brought up by his mother. In 1199 he received Masovia and in 1202, Kuyavia.
King Ottokar II of Bohemia came on crusade and helped them to establish Konigsberg (modern day Kaliningrad) whilst the Natangians were brutally suppressed. This expansion came to a sudden halt when the Lithuanians under their king Mindaugas decided to hit back against the constant intrusions.
Konrad / Conrad II: First duke of Czersk. Died childless. 1294 - 1310: With the death of the heirless Konrad, Czersk is probably merged into other Mazovian territories although Mazovia as a whole is now dominated by Bolesław II of Płock. In 1310 it becomes a territory which is united with the duchy of Warsaw. 1310 - 1341: Trojden I
