Felice Osio was born in Milan in 1587 into an ancient noble family that, according to Giacomo Filippo Tomasini, claimed to descend from Osius, high priest of the temple of Delphi.
[2] He then embraced holy orders, and, having chosen to become a teacher, lectured on humanities at the Swiss seminary in Milan, then at Bergamo.
[4] Osio was equally gifted in writing in verse; and numerous collections offer his compositions.
He was the first to conceive the project, subsequently carried out by Muratori, of forming a great collection of source documents on the medieval history of Italy.
He was unable to complete his study on the works of Albertino Mussato; and this was, says Tiraboschi, a disappointment for lovers of the historical genre, for he had such a facility for writing, and was so fond of digressions, that he would have filled a great number of folio volumes with his notes.
[9] His commentary on the History or Chronicle of Lodi, by Ottone and Acerbo Morena, Venice, 1639,[10] appeared in volume I of the Scriptor.