The introduction underlines the spiritual pride of the Greeks. In the first part, discussing of the primacy of the Roman church (and of its orthodoxy), there is also an ample account of the Council of Florence, reporting also its documents (f. p8v-q1r).. The second part presents the history of the divisiones of the Greeks (and their heresis) by finishing the description provided by the previous two sermons. It deals also with the crusade of 1204 and with the recent events, i.e. the fall of Constantinople and the domain of the Turks. Detailed account of the profanation of Constantinople, which is framed as a just divine punishment. Final address: "O greci vani, o superbi, o elati, o maledicentes sedi sancte et obstinati, nonne ultio digna dei venit super vos ut qui obedire renuistis vicario dei iam obediatis spurce genti, intelligite itaque quod initium omnis peccati est superbia ..." (f. q4r). It follows the identification of Constantinople with the fall of Babylon in Revelation 18 and the hope that the surviving Greeks will finally see which is thr true faith.