Ubaldo I Visconti

Ubaldo I Visconti (died 1230) was a Pisan nobleman, son of the patrician Eldizio Visconti and brother of Lamberto. In 1214 he and Lamberto attacked Cagliari and Arborea, and the next year their forces seized the hill overlooking Cagliari, the future Castel di Castro.

By 1217 Ubaldo had forced the judge Benedetta to cede her giudicato and hold it as Pisa's vassal. In 1220 he arranged Lamberto's marriage to the widowed Benedetta and governed Cagliari on his brother's behalf. He died in 1230; his son John later inherited Gallura.