Lotario is a Latin, Italian, and Spanish masculine given name, while Lotário is a Portuguese masculine given name. Both names are modern forms of the Germanic Chlothar (which is a blended form of Hlūdaz and Harjaz). People with this name include:
Lotario dei Conti di Segni, birthname of Pope Innocent III (1160 or 1161 – 1216), Italian Roman Catholic Pope Lotario Tomba (1749–1823), Italian architect
Fictional characters include: Lotario, alto in Handel's opera Lotario Lotario, in Miguel de Cervantes’s Don Quixote
See also Lotario (Handel) Lothario Bonifacio di Castel Lotario (died 1504), Italian Roman Catholic prelate
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