It's Easter and Alexander makes plans for a celebration to end his pious fast even as Della Rovere's assassin ascends to the position of the Pope's taster. Lucrezia's lover asks for her hand in marriage but her father dismisses him and his request. Juan's wild behavior threatens the life of Lucrezia's child, forcing Cesare to make a chilling decision about his brother.

Tragic news for the Borgia family is followed by a shocking revelation from Cesare; Lucrezia surprises herself by falling for a new suitor, Alfonso of Aragon, and accepts his proposal of marriage; Cesare tortures the rebel leader Savonarola but can't extract a confession, so he fakes one and burns the heretic; the assassin finally strikes with a poisoned chalice of wine.