# John Adolphus, Duke of Schleswig-Holstein-Sonderburg-Plön

> German duke (1634-1704)

**Wikidata**: [Q475894](https://www.wikidata.org/wiki/Q475894)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/John_Adolphus,_Duke_of_Schleswig-Holstein-Sonderburg-Plön)  
**Source**: https://4ort.xyz/entity/john-adolphus-duke-of-schleswig-holstein-sonderburg-pl-n


## References

1. The Peerage
2. Dansk Biografisk Leksikon
3. Freebase Data Dumps. 2013
4. Virtual International Authority File
5. CERL Thesaurus