The dates and circumstances of the end…
752 CE
The dates and circumstances of the end of Constantinople’s rule over Sardinia are not known.
Direct central control had been maintained at least through about the year 650, after which local legates had been empowered in the face of the rebellion of Gregory the Patrician, Exarch of Africa and the first invasion of the Umayyads in North Africa.
There is some evidence that senior imperial administration in the Exarchate of Africa had retreated to Cagliari following the final fall of Carthage to the Arabs in 697.
The loss of imperial control in Africa had led to escalating Moorish and Berber raids on the island, the first of which is documented in 705, forcing increased military self-reliance in the province.
The first Muslim assault on Sardinia, under Abd al-Rahman ibn Habib al-Fihri, is perhaps the beginning of the occupation of the island by the Saracens that is to last until 1005.
He also attempts unsuccessfully, as had his father in 740, to invade Sicily.