# Wilhelm Kettler

> Duke of Courland (1574–1640)

**Wikidata**: [Q704535](https://www.wikidata.org/wiki/Q704535)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Wilhelm_Kettler)  
**Source**: https://4ort.xyz/entity/wilhelm-kettler


## References

1. Integrated Authority File
2. Virtual International Authority File
3. Find a Grave
4. Freebase Data Dumps. 2013
5. CERL Thesaurus
6. Sejm-Wielki.pl