Machiavelli's first Decennale is an historical poem in terza rima dealing with events that were of concern to the Florentine Republic in the years 1494-1504. Two slightly different forms exist: an earlier one, preserved in the Mediceo-Laurentian MS. Plut. XLIV, 41, which contains a dedication dated 8 November 1504, and a later one first printed in February 1506. At least three early editions of this text were printed, although no copy of one of them, a pirated edition, is known to exist.
The Laurentian MS. contains two forms of a dedication addressed to Alamanno Salviati, one in Latin and one in Italian (here printed as Appendix A), neither of which occurs in the printed editions, which have instead a prefatory letter by Agostino Vespucci. The Salviati dedication, in the Latin version, states that the poem had been written at his suggestion and, in both the Latin and Italian versions, that it was written in fifteen days, which, even if the boast were only approximate, would indicate, from the contents of the poem and the date of those dedications, that the poem was written in the autumn of 1504.