House of Piast in the context of "Siemowit V of Masovia"

Leszek II the Black (c. 1241 – 30 September 1288), was a Polish prince of the House of Piast, Duke of Sieradz since 1261, Duke of Łęczyca since 1267, Duke of Inowrocław in the years 1273-1278, Duke of Sandomierz and High Duke of Poland from 1279 until his death.

Bolesław II of Masovia or Bolesław II of Płock (pl: Bolesław II mazowiecki (płocki); ca. 1253/58 – 20 April 1313), was a Polish prince, member of the House of Piast, Duke of Masovia during 1262-1275 jointly with his brother, after 1275 sole ruler over Płock, after 1294 ruler over all Masovia and Duke of Kraków and Sandomierz during 1288-1289. In 1310 he gave to his sons the districts of Warsaw and Czersk. Also High duke of Poland twice (1288, 1289).

Siemowit IV (Ziemowit IV), also known as Siemowit IV the Younger (pl: Siemowit IV Młodszy; ca. 1353/1356 – 21 January 1426), was a Polish prince, member of the Masovian branch of the House of Piast and from 1373 or 1374 Duke of Rawa, and after the division of the paternal inheritance between him and his brother in 1381, ruler over Rawa, Płock, Sochaczew, Gostynin, Płońsk and Wizna, after 1386 hereditary Polish vassal, after 1388 ruler over Belz. During 1382–1401 he lost Wizna and during 1384–1399 and 1407–1411 he lost Zawkrze, during 1384–1399 he lost Płońsk, which was taken by the Teutonic Order.

He was the second son of Siemowit III, Duke of Masovia and his first wife Euphemia, daughter of Nicholas II of Opava.

Elisabeth of Wrocław (Polish: Elżbieta wrocławska) (c. 1232 – 16 January 1265), also known as Elisabeth of Poland, was a daughter of Henry II the Pious and his wife, Anna of Bohemia. She was a member of the House of Piast and was Duchess consort of Greater Poland by marriage.

Emnilda (Polish: Emnilda słowiańska; c. 970–975 – 1017), was a Slavic noblewoman and Duchess of Poland from 992 by her marriage with the Piast ruler Bolesław I the Brave.