In Elissa’s ninth tale (IX, 2), Abbess Usimbalda runs the convent where Sister Isabetta lives. She sneaks her lover into the convent frequently, despite her pious reputation. She’s caught when she accidentally puts her lover’s breeches on her head in the middle of the night, and she immediately switches from chastising Sister Isabetta to excusing her actions. She is thus part of The Decameron’s anticlerical satire.