# Jan II the Good

> Duke of Opole and other Silesian duchies

**Wikidata**: [Q479934](https://www.wikidata.org/wiki/Q479934)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Jan_II_the_Good)  
**Source**: https://4ort.xyz/entity/jan-ii-the-good


## References

1. Integrated Authority File
2. Freebase Data Dumps. 2013
3. CERL Thesaurus
4. [Source](https://encyklopedia.pwn.pl/haslo/Jan;3916570.html)
5. Sejm-Wielki.pl
6. Bibliography of the History of the Czech Lands