Mid 17th century (in an earlier sense). From Italian romanzo, †romansoromance. In some forms probably after either Portuguese romançoromance or Spanish †romanço.
Definition of romanzo in US English:
romanzo
(also romanso)
nounrə(ʊ)ˈmantsəʊ
rare
Romance 3a.
Origin
Mid 17th century (in an earlier sense). From Italian romanzo, † romanso romance. In some forms probably after either Portuguese romanço romance or Spanish † romanço.