generalissimo
noun /ˌdʒenrəˈlɪsɪməʊ/
/ˌdʒenrəˈlɪsɪməʊ/
(plural generalissimos)
(from Italian)- a person who commands all the armed forces of a country, especially one who has political as well as military powerWord Originearly 17th cent.: Italian, ‘having greatest authority’, superlative of generale (see general).