# Konrad II the Gray

> Polish Duke

**Wikidata**: [Q481400](https://www.wikidata.org/wiki/Q481400)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Konrad_II_the_Gray)  
**Source**: https://4ort.xyz/entity/konrad-ii-the-gray


## References

1. Catalog of the German National Library
2. Virtual International Authority File
3. Freebase Data Dumps. 2013
4. CERL Thesaurus
5. Sejm-Wielki.pl