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.
Their third was in the southwest; in 1272 approximately, Count Ugolino della Gherardesca established the significant mining town of Villa di Chiesa in Cixerri, now known as Iglesias. A woman from the Gherardesca family also wed John Visconti, who served as the Judge of Gallura and received the northeastern third of Cagliari.