The armies of the French invade Italy and decimate the town of Lucca as Della Rovere comes to comprehend what damage he has wrought with his warmongering as many powerful Italian leaders flee the onslaught. Meanwhile, the pope dispatches Giulia to discover what she can glean from Lucrezia, whom she finds with child; Cesare follows Ursula to a convent, where she spurns his advances; and in Milan, Leonardo da Vinci schools King Charles of France and Della Rovere on his concepts of battle