His literary works included a description of the geography and history of Lake Como entitled Larius and the epic poem La caduta de' Longobardi (The Fall of the Lombards).

His letters of 1629 describing the advance of invading German armies in the region around Lake Como and the plague epidemic they brought in their wake were used by Manzoni as a source for his 1827 novel I Promessi Sposi.

Several prominent members of the Roman Curia and the Milanese senator Giovanni Battista Arconati had successfully intervened with the authorities on his behalf over the incident with his brother.

In 1625 he also spent three months in Rome, having travelled there via Bologna and Florence, and continued working on La Caduta dei Longobardi with the encouragement of the poet Alessandro Tassoni.

Nevertheless, in 1628 Boldoni was promoted to the most important chair of philosophy at Pavia despite competition from Nicola Sacco who had taught at the university for over thirty years and was considered a renowned authority on Aristotle.

[2][3] Boldoni's letters of 1629 written while he was sojourning in Bellano describe the ravages of the advancing German armies in the region around Lake Como and the plague which the soldiers brought in their wake.