# Johann Ernst Ferdinand, Duke of Schleswig-Holstein-Sonderburg-Plön-Rethwisch

> (1684-1729)

**Wikidata**: [Q15877044](https://www.wikidata.org/wiki/Q15877044)  
**Source**: https://4ort.xyz/entity/johann-ernst-ferdinand-duke-of-schleswig-holstein-sonderburg-pl-n-rethwisch


## References

1. Catalog of the German National Library
2. The Peerage
3. CERL Thesaurus