# Sylvester IV

> Italian presbyter and priest, antipope from 1105 to 1111

**Wikidata**: [Q368150](https://www.wikidata.org/wiki/Q368150)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Antipope_Sylvester_IV)  
**Source**: https://4ort.xyz/entity/sylvester-iv


## References

1. Virtual International Authority File
2. Freebase Data Dumps. 2013
3. CERL Thesaurus
4. Dizionario Biografico degli Italiani
5. Enciclopedia Treccani
6. Dizionario di Storia
7. HMML Authority File