Their third was the south-western third; in the 1272 circa the count Ugolino della Gherardesca founded in the Cixerri the important mining town of Villa di Chiesa, today Iglesias. A Gherardesca woman also married John Visconti, the Judge of Gallura, who had received the northeastern third of Cagliari.
In 1272, Count Ugolino della Gherardesca founded Villa di Chiesa in Cixerri (now Iglesias), a significant mining town. Additionally, a woman from the Gherardesca family married John Visconti, who became the Judge of Gallura and received the northeastern part of Cagliari.