# Johann I.

> Peerage person ID=7851

**Wikidata**: [Q18626356](https://www.wikidata.org/wiki/Q18626356)  
**Source**: https://4ort.xyz/entity/johann-i-


## References

1. The Peerage
2. Genealogics
3. Integrated Authority File
4. CERL Thesaurus
5. Sejm-Wielki.pl