He visits Petrarch at Milan 137 Moral Change in him 137 1361. A singular Circumstance occurs which achieves this moral Work 139 He communicates this Circumstance to Petrarch 140 Petrarch's Letter in Answer 140 1363. Power and Influence of Acciajuolo, Seneschal of Naples 142 He invites Boccaccio to his Palace 142 His unworthy Treatment of Boccaccio 143 He removes from his Palace in consequence 143 He returns to Florence 143 His Residence at Certaldo 144 His Work, "De Casibus Virorum et Færainarum Illustrium" 145 1355. His Embassy to Pope Urban V. 145 He projects a Visit to Venice 145 His Letter to Petrarch, whom he missed seeing 145 1370. His Visit to Niccolo di Montefalcone, Abbot of the Carthusian Monastery of San Stefano, in Calabria 147 1372. He visits Naples 147 1373. He returns to his Retreat at Certaldo 147 His Work on "The Genealogy of the Gods" 147 The Professorship for the Public Explanation of the "Divina Commedie" conferred on him 148 1374. Petrarch's Death 149 Grief of Boccaccio 149 1375. (December 21st.) Death of Boccaccio 149 LORENZO DE' MEDICI.