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Lombard principalities in the tenth century

The independent state of Salerno inspired the gastalds of Capua to move towards independence, and by the end of the century they were styling themselves "princes" and as a third Lombard state. The Capuan and Beneventan states were united by Atenulf I of Capua in 900. He subsequently declared them to be in perpetual union, and they were separated only in 982, on the death of Pandulf Ironhead. With all of the Lombard south under his control, except Salerno, Atenulf felt safe to use the title Princeps Gentis Langobardorum ("prince of the Lombard people"), which Arechis II had begun using in 774. Among Atenulf's successors the principality was ruled jointly by fathers, sons, brothers, cousins, and uncles for the greater part of the century. Meanwhile, the prince Gisulf I of Salerno began using the title Langobardorum Gentis Princeps around mid-century, but the ideal of a united Lombard principality was realised only in December 977, when Gisulf died and his domains were inherited by Pandulf Ironhead, who temporarily held almost all Italy south of Rome and brought the Lombards into an alliance with the Holy Roman Empire. His territories were divided upon his death.

Landulf the Red of Benevento and Capua tried to conquer the principality of Salerno with the help of John III of Naples, but with the aid of Mastalus I of Amalfi, Gisulf repulsed him. The rulers of Benevento and Capua made several attempts on Byzantine Apulia at this time, but late in the century, the Byzantines, under the stiff rule of Basil II, gained ground on the Lombards.

The principal source for the history of the Lombard principalities in this period is the Chronicon Salernitanum, composed late in the tenth century at Salerno.