Jordan I (Italian: Giordano) (after 1046 – 1091), count of Aversa and prince of Capua from 1078 to his death, was the eldest son and successor of Prince Richard I of Capua and Fressenda, a daughter of Tancred of Hauteville and his second wife, also named Fressenda, and the nephew of Robert Guiscard, duke of Apulia, Calabria, and Sicily. He, according to William of Apulia, "equalled in his virtues both the duke and his father."
In 1071, Jordan briefly rebelled against his father with the support of his uncle, Ranulf. In 1078, while his father was besieging Naples with Robert Guiscard, Jordan and Robert, count of Loritello, were ravaging the Abruzzi, then papal territory. He, his father, and the duke were all excommunicated, when, suddenly, his father fell ill, retired to Capua, reconciled with the church, and died. Jordan, fearing to rule under the ban of the church, called off the siege of Naples and went to Rome to reconcile himself to Pope Gregory VII and rectify his relations with the church, of which his father had been both servant and protector. It appears that he intended to take up the position of his father vis-a-vis the papacy and to return to unfriendly relations with the duke of Apulia, for Gregory visited Capua a mere three months after Richard's death and Jordan, probably with papal prodding, began fomenting revolt in the Guiscard's lands. The revolt, the widely supported and well-organised, was ineffectual in really curbing Robert's influence and power.