Marianus IV of Arborea

Marianus IV (1317–1375), called the Great, was the second son of Judge Hugh II of Arborea and Benedetta. He married Timbora of Rocabertí in 1336, and in 1339 Peter IV made him count of Goceano and Marmilla. There he repopulated Burgos and issued the rural code later absorbed into his daughter Eleanor's Carta de Logu.

Proclaimed judge in 1347 after his brother Peter III died, he went to war with the Catalans. Peter IV sent nearly twelve thousand men in 1354 and gained little, and peace came at Sanluri in 1355.

When fighting resumed in 1365 Marianus besieged Cagliari and took Villa di Chiesa; in 1368 he and his son Hugh destroyed a Catalan army at Oristano. When he died in May 1375, nearly all Sardinia was Arborea's.