# Siemowit I of Masovia

> Polish duke

**Wikidata**: [Q2701734](https://www.wikidata.org/wiki/Q2701734)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Siemowit_I_of_Masovia)  
**Source**: https://4ort.xyz/entity/siemowit-i-of-masovia


## References

1. Freebase Data Dumps. 2013
2. Sejm-Wielki.pl