Siegfried I was the Abbot of Fulda from 25 December 1058 until 6 January 1060, and from January 1060 until his death in February 1084, he was Archbishop of Mainz.
- Occupation
- Catholic priest, archbishop
- Position held
- abbot, Roman Catholic Archbishop of Mainz, Catholic archbishop, archbishop
- Citizenship
- Germany
- Died
- February 16, 1084