# Ulrich I, Count of East Frisia

> First Count of East Frisia

**Wikidata**: [Q522977](https://www.wikidata.org/wiki/Q522977)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Ulrich_I,_Count_of_East_Frisia)  
**Source**: https://4ort.xyz/entity/ulrich-i-count-of-east-frisia


## References

1. [Source](http://www.regesta-imperii.de/id/1464-10-01_1_0_13_5_0_10779_155)
2. Virtual International Authority File
3. Integrated Authority File
4. Freebase Data Dumps. 2013
5. [Source](http://www.regesta-imperii.de/id/1454-09-30_1_0_13_5_0_10735_111)
6. CERL Thesaurus