Abbot Abo and William of Baskerville's formal relationship

Abbot Abo and William of Baskerville's formal relationship begins on the first day of William's arrival at the abbey, when Abo, having heard of William's reputation for acumen and his past experience as an inquisitor, asks him to shed light on the mysterious death of Adelmo of Otranto. The abbot's request is carefully framed: he needs an acute and prudent man who can distinguish not only good from evil but also what is expedient from what is not, and who can uncover a secret while preserving the honor of the abbey. William accepts the commission, and Abo grants him the power to question the monks and move freely about the abbey, but immediately imposes a critical restriction: the top floor of the Aedificium, the library, is off-limits. This prohibition becomes the central tension of their relationship, as William's investigation repeatedly leads him toward the library's secrets.

The Commission and Its Conditions

Abo first approaches William in the pilgrims' hospice, after William has demonstrated his deductive skill by describing the abbot's lost horse, Brunellus, without having seen it. The abbot reveals that he has received a letter from the abbot of Farfa praising William's wisdom and his past work as an inquisitor, where he distinguished himself by often finding the accused innocent. Abo expresses his need for a man who can uncover the truth about Adelmo's death while also being prudent enough to cover it if necessary, to avoid scandal among the shepherds of the church. William agrees to the task, and Abo formally grants him the authority to question the monks and move freely throughout the abbey. However, when William asks to visit the library, the abbot refuses, explaining that the library is a labyrinth whose secrets are known only to the librarian and his assistant, and that it must remain inaccessible to protect the books and the knowledge they contain. This restriction immediately signals that the library is the heart of the mystery.

The Library as a Point of Conflict

The prohibition against entering the library becomes a recurring point of tension between Abo and William. When William argues that he cannot study Adelmo's death without seeing the place where it may have begun, the abbot replies that a man who described Brunellus without seeing him will have no difficulty studying places to which he does not have access. William bows to this authority, but the restriction only deepens his suspicion that the library holds the key to the crimes. Throughout the investigation, Abo repeatedly insists that the library is not connected to the murders, even as the evidence increasingly points to the forbidden books within it. When William later reveals that he has deduced the existence of the finis Africae and the forbidden book, the abbot is shocked and angered, realizing that William has violated his trust. This confrontation marks a turning point: Abo, now fearful that the scandal will damage the abbey's reputation, abruptly dismisses William and orders him to leave the next morning, effectively ending their formal relationship.

The Abbot's Dual Role: Patron and Obstacle

Abo's role in the investigation is paradoxical: he is both the patron who commissions William and the primary obstacle to his success. He provides William with the authority to question monks and move about the abbey, but he also withholds crucial information, such as the existence of the secret passage through the ossarium and the true nature of the library's defenses. When William presses him for the name of the person who might know the library's secrets, the abbot deflects, speaking instead of the mystical language of gems and the authority of the church. He refuses to cooperate further, insisting that he will handle the matter himself. This refusal ultimately leads to his own death: when he later tries to enter the finis Africae through the secret passage, Jorge of Burgos traps him inside, and he suffocates. William's final assessment of Abo is harsh: he calls him a proud feudal lord, more concerned with the honor of his abbey than with justice, and a man who would rather conceal the truth than allow it to damage his reputation.

The Relationship's Narrative Significance

The formal relationship between Abo and William serves as the structural framework for the entire investigation. Abo's initial commission sets William on the path of inquiry, while his prohibition against entering the library creates the central mystery that drives the plot. The tension between the abbot's desire for discretion and William's relentless pursuit of truth mirrors the larger conflict between the forces of concealment and revelation that pervades the novel. Abo's eventual refusal to cooperate and his subsequent death underscore the novel's theme that the pursuit of knowledge, when obstructed by pride and fear, leads to destruction. The relationship also highlights William's role as an outsider, a Franciscan and imperial envoy who is never fully trusted by the Benedictine abbot, and whose methods—rooted in reason and observation—stand in contrast to the abbot's reliance on authority and tradition.