Noun
captain general (plural captains general or captain generals)
(now historical) A commander-in-chief; the head of an armed force.
He [Philip II] subdued the Greeks after they had knocked themselves out in the Peloponnesian War and appointed himself Captain General so that he could uphold the ideals of Hellas. The main ideal of Hellas was to get rid of Philip, but he didn't count that one. Will Cuppy
Invasion and Absorption of Los Altos main Captain General Rafael Carrera after being appointed President for Life of the Republic of Guatemala in 1854. Source: Internet
Marek, p.34 Francesco, in his capacity of Captain General of the Venetian armies, was often required to go to Venice for conferences which left Isabella in Mantua on her own at La Reggia the ancient palace which was the family seat of the Gonzagas. Source: Internet
Because of the invasions, the first Captain General was sent to Fuerteventura, charged with defending the island in the name of the crown. Source: Internet
One of those roles was Captain General of the Marines. Source: Internet