Constantine I was the Giudice of Gallura

Giudice of Gallura

The giudici of Gallura were the local rulers of the northeast of Sardinia during the Middle Ages. Theirs was the closest giudicato to Corsica.*Manfred...

 from probably before 1065 to sometime before 1100. He was probably a member of the Gherardeschi family of Pisa

Republic of Pisa

The Republic of Pisa was a de facto independent state centered on the Tuscan city of Pisa during the late tenth and eleventh centuries. It rose to become an economic powerhouse, a commercial center whose merchants dominated Mediterranean and Italian trade for a century before being surpassed and...

 and governed Gallura

Giudicato of Gallura

The Giudicato of Gallura was one of four Sardinian giudicati of the Middle Ages. These were de facto independent states ruled by judges bearing the title iudex . Gallura, a name which comes from gallus, meaning rooster , was subdivided into ten curatoriae governed by curatores under the judge...

 on behalf of the Republic.

Constantine was alive in 1073 and a letter of Pope Gregory VII

Pope Gregory VII

Pope St. Gregory VII , born Hildebrand of Sovana , was Pope from April 22, 1073, until his death. One of the great reforming popes, he is perhaps best known for the part he played in the Investiture Controversy, his dispute with Henry IV, Holy Roman Emperor affirming the primacy of the papal...

 dated 1074. Constantine took part in the early infusion of Western monasticism in Sardinia

Sardinia

Sardinia is the second-largest island in the Mediterranean Sea . It is an autonomous region of Italy, and the nearest land masses are the French island of Corsica, the Italian Peninsula, Sicily, Tunisia and the Spanish Balearic Islands.The name Sardinia is from the pre-Roman noun *sard[],...

 and he supported the Gregorian reform

Gregorian Reform

The Gregorian Reforms were a series of reforms initiated by Pope Gregory VII and the circle he formed in the papal curia, circa 1050–80, which dealt with the moral integrity and independence of the clergy...

 and the archdiocese of Pisa.

According to legend, Constantine was the father of Francesca Chica, who married Henry of Cinarca, one of the most powerful men on Corsica

Corsica

Corsica is an island in the Mediterranean Sea. It is located west of Italy, southeast of the French mainland, and north of the island of Sardinia....

.