John of Arborea

John, called Chiano (died 23 March 1304), was Judge of Arborea from 1297, succeeding his father Marianus II. In 1287 he married Giacomina, daughter of the Pisan noble Ugolino della Gherardesca.

After Gallura fell in 1288, Arborea was the only giudicato left on Sardinia. Pope Boniface VIII created the Kingdom of Sardinia and Corsica for James II of Aragon. Preparing to resist, John ceded to Pisa in 1300 his third of Cagliari, the silver mines and part of the royal demesne.

Alienating public land provoked a popular revolt, and rebels killed and mutilated him. His sons Andrew and Marianus, born of his relationship with Vera Cappai, succeeded him.