The retrospective analysis undertaken by our working group in the sphere of infectious diseases, with particular emphasis on nineteenth-century epidemics, regards influenza, which according to the scholar W.I. Beveridge, was defined as "one of the greatest enemies of man". The work is divided into three parts: influenza, its historical names and the characteristics of the recurrent epidemics from the sixteenth to the nineteenth century among the world's population. This part is followed by treatment and remedial action in the nineteenth century. The third, deals with death attributed to influenza and its complications observed in the city of Ferrara in the years when outbreaks occurred, affecting the majority of the populations: 1830-1833, 1836-1837, 1847-1848, 1857-1858, 1873-1875, 1889-1892, the latter known as the great pandemic.