Bolesław IV the Curly, a member of the Piast dynasty, was Duke of Masovia from 1138 and High Duke of Poland from 1146 until his death in 1173.
- Occupation
- politician
- Position held
- King of Poland, Duke of Masovia
- Citizenship
- Poland
- Born
- 1120, 1125, 1122
- Died
- January 5, 1173, 1173