# Friedrich II. von Sommerschenburg
**Wikidata**: [Q1270838](https://www.wikidata.org/wiki/Q1270838)  
**Source**: https://4ort.xyz/entity/friedrich-ii-von-sommerschenburg


## References

1. The Peerage
2. Integrated Authority File
3. Catalog of the German National Library
4. Sejm-Wielki.pl