# Berthold IV, Duke of Zähringen

> Duke of Zähringen and Rector of Burgundy

**Wikidata**: [Q69334](https://www.wikidata.org/wiki/Q69334)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Berthold_IV,_Duke_of_Zähringen)  
**Source**: https://4ort.xyz/entity/berthold-iv-duke-of-z-hringen


## References

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