Visconti of Pisa and Sardinia Ubaldo. In 1207, Lamberto married Elena, the heiress of Barisone II of Gallura, thus securing control over the northeastern corner of Sardinia with his capital at Civita. In 1215, he and Ubaldo established their hegemony over the Giudicato of Cagliari in the south of the island as well. Through advantageous marriages, Lamberto's son, Ubaldo II, secured power in Logudoro for a time. By mid century, Pisan authority was unopposed in Sardinia, thanks to intermarriages between the Visconti family and the other great families of Pisa (Gherardeschi and Capraia) and Sardinia (Lacon and Bas-Serra). Visconti of Pisa and Sardinia The Visconti
Sardinia Kingdom ended and Sardinia was returned to Roman rule. In 533, Sardinia returned to the rule of the Byzantine Empire when the Vandals were defeated by the armies of Justinian I under the General Belisarius in the Battle of Tricamarum, in their African kingdom; Belisarius sent his general Cyril to Sardinia to retake the island. Sardinia remained in Byzantine hands for the next 300 years aside from a short period in which it was invaded by the Ostrogoths in 551. Under Byzantine rule, the island was divided into districts called "mereíai" (μερείαι) in Byzantine Greek, which were governed by a