He first bears the title iudex Caralitanus in a document of 13 February 1130 in which he confirmed certain donations of his father in Pisa.
The monks, mostly foreign immigrants, brought economic, technological, ecclesiastic, agricultural, and educational advances as well as close ties to continental Europe.
Constantine patronised the monasteries founded by monks from Saint-Victor in Marseille, who dominated religious life in Cagliari at the turn of the twelfth century.
Along with Gonario II of Torres and Comita I of Gallura, Constantine pledged fidelity to the archbishop of Pisa.
The second daughter, Giorgia, married Obert, Margrave of Massa; the third, Preziosa, Tedice di Donoratico (della Gherardesca), Pisan count of Castagneto.