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Boleslaw II of Masovia or Boleslaw II of Płock (c.1251- April 20, 1313). He was the younger brother Conrad II of Masovia and son of Siemowit I of Masovia. His mother was Pereyaslava , daughter of Daniel of Galicia.

Boleslaus became Duke of Masovia in 1262. In 1275, he shared Masovia with his brother and he became Duke of Płockmarker. From 1294, Boleslaus reigned over all of Masovia. In 1288 he became Duke of Sandomierz. In 1310 he offered some of Masovia to his son (the Duchy of Warsawmarker and the Duchy of Czerskmarker).

Duke of Płock

In 1262 Boleslaus' father, Siemowit was killed by the Lithuanians who also captured his brother. The regency of the duchy of Masovia was then ensured by Boleslaw the Pious and Boleslaus' mother Pereyaslava.

In 1275 when he reached the age of majority, Masovia was shared between him and his brother. He received the Duchy of Płock. Boleslaw did not like how much of the Duchy he was receiving and a prolonged conflict between the two brothers broke out. In 1279, there was an alliance with the Lithuanians and Boleslaus married Sophia, the daughter of Grand Duke Treniota of Lithuania. Boleslaus was also an ally of his cousin Władysław I the Elbow-high, who was then Duke of Kuyavia.

Fighting for Krakow and Sandomierz

In September 30, 1288, Leszek II the Black died without leaving an heir. Part of the nobility of Lesser Poland supported the accession of Boleslaus. He faced Henry IV the Probus, the Duke of Wrocławmarker, who aimed to succeed in Krakowmarker as well as Boleslaus did. In 1288, Boleslaus seized Sandomierzmarker and Krakowmarker. On February 26, 1289 he defeated Henry IV the Probus.

Despite the victory, the inhabitants of Cracow offered power to Henry IV rather than Boleslaus. Powerful Lesser Poland rallied to Henry IV, ending the hopes of Boleslaw ascended the throne in Cracow. This leaves the Duchy of Sandomierz his brother Conrad II CzerskThis very very dissatisfied nobles Lesser Poland, accustomed to see the Duke of Krakow reign over Sandomierz. Finally, Boleslaw left to Ladislaus Ier In short, all the rights on the Little Poland and retired to his duchy. The only positive aspect of this struggle for the throne of Krakow was the reconciliation with his brother Conrad.


  1. A. Guibourgé-Czetwertyński (Baumgarten I/XI)

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