Collection of historical accounts of the sieges of Ancona. The main work (ff. 25r-130r) is Biagio's account of the construction, siege, and destruction of the citadel of Ancona between 1348 and 1383. The main work is preceded by an Italian translation of Boncompagno's Latin work on the siege of 1174, with the translation attributed to Biagio, as well as Italian translations of two shorter passages on Ancona. A note laid in by an unidentified mid-19th century English owner describes one of these as "enlarged extracts from the Doge Andrea Dandolo" (f. 17r); the other is attributed in the text to "Meser Francesco Petrarcha nel suo libro de la imperatori et pontifici" (f. 21r). At the end of the volume is a copy of the Latin text of the letter from the Florentines to the people of Ancona, written by Coluccio Salutati, offering congratulations for the victory of 1383, with its conclusion missing.