Ranulf I was the count of Caiazzo in the Principality of Capua from about 1078. He also brought the formerly Lombard counties of Alife, Telese and Sant'Agata dei Goti and the castles of Airola and Tocco Caudio under his control, dominating the region between Capua and Benevento. He passed this territorial lordship on intact to his heirs, and it remained in their possession until the death of his grandson and namesake, Ranulf II, in 1139.
- Occupation
- military personnel
- Died
- 1088
