Written in Latin on parchment, the text is buried along with gold coins at the base of the Mussolini Obelisk in the Foro Italico sports complex in Rome.
The existence of the text was uncovered by two scholars, Bettina Reitz-Joosse from University of Groningen in the Netherlands and Han Lamers from Humboldt University Berlin.
They are first to translate the Codex Fori Mussolini, which is buried at the base of the 300-tonne monument erected in 1932.
"The obelisk was a major spectacle but the existence of the text wasn't reported at all. It was meant for an audience in the remote future," Reitz-Joosse, was quoted as saying by the 'BBC News'.
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The 1,200-word eulogy describes the rise of fascism and Mussolini's feats. It was written by a classical scholar, Aurelio Giuseppe Amatucci in three parts.
"The text presents Mussolini as a kind of new Roman emperor, but also, by using biblical language, as the saviour of the Italian people," Lamers said, who also works with the Catholic University of Leuven.
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