The Marquises and Dukes of Montferrat were the rulers of a territory in Piedmont south of the Po and east of Turin called Montferrat. The March of Montferrat was created by Berengar II of Italy in 950 during a redistribution of power in the northwest of his kingdom. It was originally named after and held by the Aleramici. In 1574, Montferrat was raised to a Duchy by Maximilian II, Holy Roman Emperor (see Duchy of Montferrat). Marquises Aleramici dynasty William I (d. 933 or before) Aleramo (933–967) William II, son and co-ruler Otto I (967–991), son William III (991 – bef. 1042), son Otto II (bef. 1042 – c. 1084), son Henry (d. 1045), brother and co-ruler William IV (c. 1084 – c. 1100), son Rainier (c. 1100 – c. 1136), son William V (c. 1136–1191), son Conrad (1191–1192), son Boniface I (1192–1207), brother William VI (1207–1225), son Boniface II (1225–1253/55), son William VII (1253/55–1292), son John I (1292–1305), son Paleologo dynasty Theodore I (1306–1338), nephew of John John II (1338–1372), son Secondotto, also known as Otto III (1372–1378), son John III (1378–1381), brother Theodore II (1381–1418), brother John Jacob (1418–1445), son John IV (1445–1464), son William VIII (1464–1483), brother Boniface III (1483–1494), brother William IX (1494–1518), son. (Father-in-law to Federico II, Duke of Mantua.) Boniface IV (1518–1530), son, under the regency of his mother Anne of Alençon John George (1530–1533), uncle Spanish occupation until 1536. Margaret of Montferrat (1533–1536), daughter of William IX and Anne of Alençon, and Marchioness of Montferrat in her own right. Gonzaga dynasty In 1536 Charles V, Holy Roman Emperor granted the marquisate, despite competing claims from Savoy and from the Marquis of Saluzzo, to the Gonzagas. This was confirmed in 1559 by the Peace of Cateau-Cambrésis. Frederick Gonzaga (1536–1540), Duke of Mantua. Married to Margaret of Montferrat, daughter of William IX and Anne of Alençon, and Marchioness of Montferrat in her own right. Francis I (1540–1550), Duke of Mantua, Marquis of Montferrat. Son of Margaret of Montferrat and Frederick Gonzaga. Guglielmo I Gonzaga (1550–1574), Duke of Mantua, Marquis until 1574, then duke. Son of Margaret of Montferrat and Frederick Gonzaga Dukes Gonzaga dynasty William X (1574–1587), Duke of Mantua, Duke of Montferrat from 1574, previously marquis Vincent I (1587–1612), Duke of Mantua and Montferrat. Son of William X Francis II (1612), Duke of Mantua and Montferrat. Son of Vincent I Ferdinand (1612–26), Duke of