# Valdemar IV, Duke of Schleswig

> German noble

**Wikidata**: [Q870782](https://www.wikidata.org/wiki/Q870782)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Valdemar_IV,_Duke_of_Schleswig)  
**Source**: https://4ort.xyz/entity/valdemar-iv-duke-of-schleswig


## References

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