Dago

The man-of-war’s-man, in sporting his money in those places, fancies himself perfectly at home; and he that dares for a moment to interrupt or oppose him, be he Dago or shipmate, will inevitably meet with a rebuff for his uninvited and indecorous intrusion; but coincide with him, extol the merits and virtues of the turpentine gin with which he is inflating himself, and you are as welcome, and will meet with as spirited and hearty reception, as great a quantity of the “precious stuff,” more or no money, as though you were his revered and legitimate brother.

Source: wiktionary

I interviewed his aid to know what the Dago's rank was (Sailors call everybody that speaks Spanish, Italian, and Portuguese, Dagos)

Source: wiktionary

JAMES, the Spaniard’s patron saint, has been compelled to lend his name as “Iago” to innumerable towns, cities and villages. From Mexico to Patagonia in Spanish America, “Santiago,” “San Diego,” “Iago” and “Diego” are such frequently recurring vocables that the Yankee sailor calls natives of these countries “Dago men,” or “Diegos.” It is his slang name for foreigners of the Latin race. It is a relic of the old days when he knew them chiefly as pirates.

Source: wiktionary

He had that treacherous snarky look, characteristic of all these Mediterranean nations, known to Yankee sailors by the generic name of Dago. However, as long as he behaved, I used him well, but I didn't trust him.

Source: wiktionary