Along with Gonario II of Torres and Comita I of Gallura, Constantine pledged fidelity to the archbishop of Pisa. All this suggests strong allegiance to the reformed papacy despite the still near-autonomous status of Cagliari at the time.
Constantine's loyalty to the archbishop of Pisa is also evident in his pledge, along with Gonario II of Torres and Comita I of Gallura. This indicates a strong allegiance to the reformed papacy, despite Cagliari's partial independence.