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.
Alongside Gonario II of Torres and Comita I of Gallura, Constantine swore loyalty to the archbishop of Pisa. This implies a strong commitment to the reformed papacy, despite Cagliari's still relatively independent status at the time.