He was a son of Comita III (by his wife Ispella of Arborea), who associated him with the government of Logudoro as early as 1203. He succeeded his father in 1218. Mariane was half-brother of Hugh I of Arborea.
His sister Maria was in 1202 married to Boniface, the heir of the Marquess of Saluzzo; their son Manfred became the third marquess. Marianus' sister Iurgia (Giorgia) was in 1210 married to Emanuele Doria, heir of the Genovese fortress in Logudorese coast.
Around 1200, Comita III came to terms with William I of Cagliari and Ubaldo I Visconti, promising to marry his son Marianus to William's daughter Agnes.
By a pact signed November 1218 with Lambert of Gallura, Marianus secured the marriage of his daughter Adelasia to Lambert's son Ubaldo. The marriage was celebrated in 1219. Pope Honorius III, enemy of the Pisans, immediately sent his chaplain Bartolomeo to annul the marriage, but he failed and the pact between Pisa and Logudoro stood. Honorius nevertheless urged Milan to aid Marianus in any opposition to Pisa.
In 1228, Peter II of Arborea allied with the Visconti of Gallura. He was consequently attacked by Marianus in concert with William II of Cagliari. They desired to maintain a condominium in Arborea, but internal fighting allowed Peter to solidify his authority with little opposition.
From 1230 to 1232, Marianus exercised the regency of Cagliari on behalf of the young William II and in right of his wife Agnes. He died in 1233 and, by his will, was succeeded by his son Barison III. Upon Barison's death (1236) without heirs, the Logudorese magnates, as specified by Marianus' will, had to elect one of his daughters Adelasia or Benedetta (who is thought to have married the Catalan Count of Empuries) to inherit. They unanimously acclaimed Adelasia, whose husband could well uphold her right. So they in turn elected him judge as well.
Sources
Ghisalberti, Alberto M. Dizionario Biografico degli Italiani: VIII Bellucci – Beregan. Rome, 1966.
Caravale, Mario (ed). Dizionario Biografico degli Italiani: Guglielmo Gonzaga – Jacobini. Rome, 2000.
Nowé, Laura Sannia. Dai "lumi" dalla patria Italiana: Cultura letteraria sarda. Mucchi Editore: Modena, 1996.
The Judicate of Arborea or the Kingdom of Arborea was one of the four independent judicates into which the island of Sardinia was divided in the Middle Ages. It occupied the central-west portion of the island, wedged between Logudoro to the north and east, Cagliari to the south and east, and the Mediterranean Sea to the west. To the northeast and beyond Logudoro was Gallura, with which Arborea had far less interaction. Arborea outlasted her neighbours, surviving well into the 15th century. At its greatest territorial extent it occupied the entire island except the cities of Alghero and Cagliari. The earliest known judicial seat was Tharros, though Oristano served as capital for most of its existence.
Comita III was the giudice of Logudoro, with its capital at Torres, from 1198 until 1218. He was the youngest of four sons of Barisone II of Torres and Preziosa de Orrubu. He ruled at a time when the great families, usually foreign, were superseding the giudici in power and influence on Sardinia.
Comita II or III was the giudice (judge) of the Judicate of Arborea from 1131 until his death. He was the son of Constantine I of Arborea, the first ruler of Arborea of the Lacon dynasty. He married Elena de Orrubu, mother of Barison II of Arborea. The dating and chronology of his reign are obscure.
William I, royal name Salusio IV, was the judike of Cagliari, meaning "King", from 1188 to his death. His descendants and those of his immediate competitors intermarried to form the backbone of the Italian Aristocracy, and ultimately their descendants in the Medici clan are precursors to, and definers of later royalty and claims thereto.
Gonario II was the giudice of the Sardinian kingdom of Logudoro from the death of his father in 1128 until his own abdication in 1154. He was a son of Constantine I and Marcusa de Gunale. He was born between 1113 and 1114 according to later sources and the Camaldolese church of S. Trinità di Saccargia was founded in his name by his parents on 16 December 1112, though it was not consecrated until 5 October 1116.
The Judicate of Cagliari was one of the four kingdoms or judicates into which Sardinia was divided during the Middle Ages.
Constantine II, called de Martis, was the giudice of Logudoro. He succeeded to the giudicato sometime between 1181 and 1191. He was the son of Barisone II and Preziosa de Orrubu. His father associated him with the government in 1170 and abdicated the throne to him around 1186. His reign was generally characterised by contemporary chroniclers as "tyrannical."
The kings or judges of Cagliari were the local rulers of the south of Sardinia during the Middle Ages. Theirs was the largest kingdom and for the eleventh through twelfth centuries contested the supremacy on the island with that of Logudoro. It was often an ally of the Republic of Pisa and an early supporter of Western monasticism.
The Judicate of Gallura was one of four Sardinian judicates in the Middle Ages. These were independent states whose rulers bore the title iudex, judge. Gallura, a name which comes from gallus, meaning rooster (cock), was subdivided into ten curatoriae governed by curatores under the judge. In the 13th century, the arms of Gallura contained a rooster.
Elena was the daughter and successor of Barisone II of Gallura and was named after her mother Odolina of the Lacon family. First queen regnant in Sardinia, she ruled Gallura from the death of her father until her own death, though she was eclipsed by her husband after 1207.
Lamberto Visconti di Eldizio was the Judge of Gallura from 1206, when he married the heiress Elena, to his own death. He was a member of the Visconti family of Pisa and the first of that dynasty to rule in Sardinia, where they lasted in Gallura for almost another century.
Ubaldo II Visconti, son of Lamberto di Eldizio and Elena de Lacon, was the Judge of Gallura from 1225 to his death in 1238. He ruled every giudicato on the island of Sardinia at one point or another save Arborea.
Biagio was the Archbishop of Torres from 1 December 1202 to his death late 1214 or early 1215.
Adelasia (1207–1259), was the Judge of Logudoro from 1236 and the titular Judge of Gallura from 1238.
Benedetta was the daughter and heiress of William I of Cagliari and Adelasia, daughter of Moroello Malaspina. She succeeded her father in January or February 1214.
William II Salusio V was the Judge of Cagliari from 1232 to his death. His Christian name was William, but his regnal name was Salusio, based on ancient Cagliaritan traditions which alternated their rulers between the forenames Torchitorio and Salusio. He would have been called Salusio in official documents, though he is known historically as William, after his grandfather, William I.
Ubaldo I Visconti was the de jure overlord of the Giudicato of Cagliari from 1217. He was a member of the Visconti family of Pisa, controlling Cagliari on behalf of his brother, who was judge jure uxoris from 1218.
Barisone III (1221–1236) was briefly the Giudice of Logudoro from 1232 until his death. He was the only son of Marianus II, whom he succeeded.
Torchitorio III, born Peter, was the Judge of Cagliari from October 1163 to his deposition and arrest in 1188, after which he was never heard of again.
William of Capraia was the regent for Marianus II of Arborea from 1241 until his death, being entitled "Judge" from 1250 on.
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