Ranulf I of Caiazzo

Ranulf I (also spelled Rainulf or Raynulf; died 1088) 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 under his control, dominating the region between Capua and Benevento (a Papal fief). 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.

Ranulf I was the youngest son of Count Asclettin of Acerenza, of the Drengot family of the Norman nobility. At the invitation of Abbot Desiderius, Ranulf was present at the dedication service of the new basilica of the Abbey of Monte Cassino on 1 October 1071. That same year, he assisted his nephew, Jordan, in a short-lived rebellion against the latter's father—Ranulf's brother—Prince Richard I of Capua. His loyalty to his nephew was rewarded when the latter succeeded Richard in 1078. Jordan granted Ranulf the old Lombard county of Caiazzo. Ranulf also accompanied Jordan on a diplomatic journey to Rome in 1078, where both nephew and uncle were reconciled with Pope Gregory VII for past encroachments on Papal territory and the ban of excommunication on them was lifted. After the death of Pope Gregory in 1085, when the lands of Monte Cassino were threatened, Desiderius called on Ranulf to defend them.

In 1078–79, Ranulf and Prince Jordan lent their support to a rebellion against Duke Robert Guiscard in the Duchy of Apulia. The rebels included Counts Peter II of Trani, Henry of Monte Sant'Angelo and Amico II of Giovinazzo, as well as four of Robert's nephews—Abelard, Herman, Count Geoffrey of Conversano and Count Robert of Montescaglioso—and the noblemen Gradilone and Baldovino. After defeating Abelard, Gradilone and Baldovino, Robert went to Salerno in July 1079, and then to Sarno, where he made peace with Prince Jordan and Count Ranulf. With the loss of Capuan support, the rebellion collapsed.

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