Constantine I of Torres

Constantine I (c. 1064 – 1128) was the giudice of Logudoro. He was co-ruling by 1082 and sole ruler by 1113. His reign is usually said to have begun about 1112.

He was the son of Marianus I, with whom he co-reigned, and Susanna de Thori.

Sometime between 1113, the first year in which Constantine is recorded as sole ruler, and 1115, a Tuscan and Lombard fleet, led by the Republic of Pisa, sailed into the harbour of Porto Torres following the successful liberation of the Balearic Islands from Saracen domination. Indeed, one of the leaders of this brigade was Saltaro, Constantine's son. According to the Liber maiolichinus, Constantine was recognised as re chiaro e molto celebrato ("clear, most-celebrated king") over the entire island of Sardinia after this.

Constantine continued the monastic reforms and expansions of his predecessors' reigns. He firstly supported the Cassinese establishments, but his favour soon shifted to the Camaldolese and Vallumbrosan houses. By 1125, Camaldolese foundations were the most numerous on the island and Vallumbrosan ones could be found in every province of Logudoro. The reasons for such strong support of monasticism, the papacy (including the Gregorian reforms), and the suzerainty of the archdiocese of Pisa were probably the advancements brought by closer ties to the mainland and the technological, economic, agricultural, educational, and religious knowledge that the monks brought.

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