Father Eugenio Barsanti (12 October 1821 – 19 April 1864), also named Nicolò, was an Italian engineer, who together with Felice Matteucci of Lucca invented the first version of the internal combustion engine in 1853, Florence. Their patent request was granted in London on June 12, 1854, and published in London's Morning Journal under the title "Specification of Eugene Barsanti and Felix Matteucci, Obtaining Motive Power by the Explosion of Gasses", as documented by the Fondazione Barsanti e Matteucci.[1][2]
Another request bears the no. 700 of Volume VII of the Patent Office of the Reign of Piedmont. We do not have the text of this patent request, only a photo of the table which contains a drawing of the engine. This may have been either a new patent or an extension of a patent granted three days earlier, on 30 December 1857, at Turin.