# Duchy of Sieradz

> Polish duchy (1231–1339)

**Wikidata**: [Q5311386](https://www.wikidata.org/wiki/Q5311386)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Duchy_of_Sieradz)  
**Source**: https://4ort.xyz/entity/duchy-of-sieradz