# Bolesław III of Masovia

> Polish prince member of the House of Piast, Duke of Płock since 1336 (under regency until 1340), ruler over Wizna and Sochaczew since 1345, formally a vassal of the Kingdom of Bohemia during all his reign

**Wikidata**: [Q2628158](https://www.wikidata.org/wiki/Q2628158)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Bolesław_III_of_Płock)  
**Source**: https://4ort.xyz/entity/boles-aw-iii-of-masovia


## References

1. WikiTree
2. Sejm-Wielki.pl