# Frederik I van Sommerschenburg

> 1055 - 18 Oct 1120

**Wikidata**: [Q2746728](https://www.wikidata.org/wiki/Q2746728)  
**Source**: https://4ort.xyz/entity/frederik-i-van-sommerschenburg


## References

1. [Source](http://saebi.isgv.de/gnd/143054899)
2. CERL Thesaurus
3. Catalog of the German National Library
4. Sejm-Wielki.pl