Docibilis I of Gaeta

The sudden disappearance of the co-hypati Constantine and Marinus I after 866 suggests that Docibilis' assumption of power was violent.

In 876, the pope was down in the Mezzogiorno recruiting the princes of Capua and Salerno for the war with the Aghlabid Emirate of Sicily.

He then began to turn and form alliances with the Lombard rulers, marrying his daughter Megalu to Rodgipert of Aquino and Euphemia to the prefect of Naples.

He began construction on the great palace whose ruins still stand in the city and he spent profusely on churches and ecclesiastic endowments for the sake of his soul.

He was a warrior-prince as well, whose quarrels with all his neighbours, Muslim and Christian, Lombard and Byzantine Greek, ecclesiastic and secular, fill the chronicles of the age, especially Erchempert's.