Bari was reduced in April 1071, and Byzantine forces were finally ousted from southern Italy. The territory around Salerno was already held by Guiscard, and in December 1076 he took the city, expelling its Lombard prince Gisulf, whose sister Sichelgaita he had married. The Norman attacks on Benevento, a papal fief, alarmed and angered Pope Gregory VII. Pressured by the emperor, Henry IV, Gregory VII turned again to the Normans, and at Ceprano in June 1080, he reinvested Guiscard, securing him also in the southern Abruzzi, while reserving Salerno.