The three-story symmetrical altar and presbytery wall is marked by a triumphal Roman arch with pediment accessing the altar, flanked on either side by doors, two niches (with the images of Saint Peter and Saint Paul respectively) and, similarly, two windows with guardrails. Generally, the form of the presbytery has an architectural form; its design is dictated by an exterior form, which were hallmarks of many of the works of Jerónimo de Ruão, much like the presbytery of the Jerónimos Monastery.