http://genealogy.euweb.cz/piast/piast2.html

Mieszko III "the Old", Pr of Cracow (1173-77)+(1190)+(1199-1202), Pr of Great Poland (1138-1202), *1126/7, +1202; 1m: 1136/40 Elisabeth of Hungary (*1128 +ca 1155); 2m: 1151/54 Yevdokia of Kiev; He left issue:

• A1. [1m.] Odon, Pr of Poznan and Kalisch 1177, *1145, +1194; m.after 1184 Vjacheslava (+after 1200) dau.of Pr Yaroslav of Halicz
  • B1. Wladislaw, *1190, +1239, Pr of Poznan; m.1218/20 Jadwiga (+1249) (maybe a Jadwiga of Pomerania, dau.of Duke Mestwin I of Pomerania)
    • C1. Przemysl I, Pr of Poznan, Kalisch and Gnesen, *1221, +1257; m.1244 Elisabeth (+1265) dau.of Duke Heinrich II of Silesia, Cracow and Great Poland
      • ...
    • C2. Boleslaw V "the Pious", Pr of Kalisch, Gnesen and of Great Poland (1243-79), *after 1221, +1279; m.1256 Jolante=Helene of Hungary (*1244 +after 1303)
      • D1. Elzbieta, *1261/63, +28.9.1304; m.1273/77 Duke Heinrich V of Liegnitz (*ca 1248 +22.2.1296)
      • D2. Jadwiga, *1266, +1339; m.ca 1279 King Wladislaw I Lokietek of Poland (*ca 1260 +2.3.1333)
      • D3. Anna, a nun at St.Clara, Gnesen, *1278
    • C3. Salomea, *before 1236, +1267/74; m.1249 Duke Conrad I of Glogau
    • C4. Eufemia, +after 1281; m.1251 Duke Wladislaw of Oppeln (+1281/2)
  • ...

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Boleslaw the Pious

Bolesław the Pious (Polish: Bolesław Pobożny) (1224/27 – 14 April 1279) was a Duke of Greater Poland during 1239–1247 (according to some historians during 1239–1241 sole Duke of Ujście), Duke of Kalisz during 1247–1249, Duke of Gniezno during 1249–1250, Duke of Gniezno-Kalisz during 1253–1257, Duke of whole Greater Poland and Poznań during 1257–1273, in 1261 ruler over Ląd, regent of the Duchies of Masovia, Płock and Czersk during 1262–1264, ruler over Bydgoszcz during 1268–1273, Duke of Inowrocław during 1271–1273, and Duke of Gniezno-Kalisz since 1273 until his death.

He was the second son of Władysław Odonic, Duke of Greater Poland by his wife Hedwig, who was probably daughter of Duke Mestwin I of Pomerania, or a member of the Premyslid dynasty. His name was very popular in the Piast dynasty, so it's unknown exactly after whom he was named. Very soon Bolesław received the nickname of "the Pious" (Latin: Pius), given to him during his lifetime by the Chronicle of the Chapter of Poznań.

...

Marriage and issue

In 1258 Bolesław married with Jolenta (Helena) (b. 1244 - d. 16/17 June aft. 1304), daughter of King Béla IV of Hungary. They had three daughters:[1][2][3]

Elisabeth (b. 1261/63 - d. September 1304), married in 1273 to Henry V, Duke of Legnica.

Hedwig (b. 1270/75 - d. 10 December 1339), married in January 1293 to Władysław I the Elbow-high, Duke of Kuyavia and since 1320 King of Poland.

Anna (b. 1276/78 - d. bef. 1300), a nun in Gniezno.

After his death without male heirs, all the Greater Poland Duchy passed to his only nephew Przemysł II. Crowned King of Poland in 1295 but murdered the next year, with his death the Greater Poland branch of the Piast dynasty became extinct.

Source / Forrás:

http://en.wikipedia.org/wiki/Boleslaw_the_Pious

http://pl.wikipedia.org/wiki/Bolesław_Pobożny

Książę kaliski w latach 1247-49, 1253r.

Książę gnieźnieński w latach 1249-50r.

Książę wielkopolski (jako opiekun bratanka) od 1257r.