# Otto Greiffenhagen

> Baltic German historian (1871-1938)

**Wikidata**: [Q5770820](https://www.wikidata.org/wiki/Q5770820)  
**Source**: https://4ort.xyz/entity/otto-greiffenhagen


## References

1. [Source](http://viaf.org/viaf/data/viaf-20170101-links.txt.gz)
2. Virtual International Authority File
3. MusicBrainz
4. [Source](https://utlib.ut.ee/eeva/index.php?lang=en&do=autor&aid=843)