Henry the Navigator
Diogo Gomes was a servant and explorer of Portuguese prince Henry the Navigator. His memoirs were dictated late in his life to Martin Behaim. They are an invaluable (if sometimes inconsistent) account of the Portuguese discoveries under Henry the Navigator, and one of the principal sources upon which historians of the era have drawn. He explored and ascended up the Gambia River in West Africa and discovered some of the Cape Verde islands.