Ambrogio Boccanegra
Ambrogio Boccanegra (c. 1333–1374), nephew of Doge Simone of Genoa, rose to command the fleet of Castile. His father Egidio, admiral of Castile, brought a fleet to Alfonso XI in 1341, and Ambrogio settled at Palma del Río. When Peter the Cruel executed Egidio in 1367 for favouring his rival Henry of Trastámara, Ambrogio fled to Henry's exiled court in France.
After Henry took the throne in 1369 he recovered Palma. As admiral he beat the Portuguese at the Guadalquivir in 1371, and in 1372 destroyed the English fleet off La Rochelle and captured the Earl of Pembroke. In 1373 he struck at Lisbon and forced Portugal to yield. He died in 1374.