# Frederick IV, Duke of Swabia

> Duke of Swabia

**Wikidata**: [Q702861](https://www.wikidata.org/wiki/Q702861)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Frederick_IV,_Duke_of_Swabia)  
**Source**: https://4ort.xyz/entity/frederick-iv-duke-of-swabia


## References

1. The Peerage
2. Integrated Authority File
3. Freebase Data Dumps. 2013
4. CERL Thesaurus
5. Sejm-Wielki.pl