The diminished Beneventan principality soon lost its independence to the papacy and declined in importance until it fell in the Norman conquest of southern Italy. The Normans, first called in by the Lombards to fight the Byzantines for control of Apulia and Calabria (under the likes of Melus of Bari and Arduin, among others), had become rivals for hegemony in the south. The Salernitan principality experienced a golden age under Guaimar III and Guaimar IV, but under Gisulf II, the principality shrank to insignificance and fell in 1078 to Robert Guiscard, who had married Gisulf's sister Sichelgaita. The Capua principality was hotly contested during the reign of the hated Pandulf IV, the "Wolf of the Abruzzi", and, under his son, it fell, almost without contest, to the Norman Richard Drengot (1058). The Capuans revolted against Norman rule in 1091, expelling Richard's grandson Richard II and setting up one Lando IV.