Ubertino is a Franciscan monk and one of the leaders of the Spiritualist movement, a faction within the order that advocates for a return to a state of poverty in the church—a position that puts him on the wrong side of the pope, who values property and political power and favors a more lenient interpretation of the Bible, making him an ally of the Emperor. Consequently, Ubertino is in exile at the abbey. He is an old friend of William’s, who is sympathetic to him but disagrees with his extreme views. Ubertino believes that the abbey’s over-preoccupation with books and learning is vanity, and accuses William of “intellectual pride”—a recurrent theme in the novel, and the same crime of which Jorge accuses his fellow monks for their attempts to read the forbidden book. After Bernard arrests Remigio and Salvatore for heresy and witchcraft, Ubertino decides to flee, since he can see that the tide is turning against the Emperor’s supporters.