sentences:  The island became disputed between the Ostrogoths, Roman "foederati" who were settled in the lands along the Riviera, and the Vandals, who had established a kingdom in Tunisia.Both groups were sometimes allies, sometimes enemies of the Romans and both followed a pattern of taking over Roman legal forms and structures and maintaining nominal deference to the empire while de facto creating autonomous kingdoms within its former borders.In 469, Gaiseric, the Vandal king, finally completed the subjugation of the isle.