The titular church in Rome of Boston’s Cardinal Sean O’Malley is the Santa Maria della Vittoria, which also happens to be featured prominently in Dan Brown’s best-seller “Angels and Demons.”

O’Malley oversees the 17th century church in his capacity as a cardinal — every Catholic cardinal is assigned a “titular” church in Rome, a largely symbolic practice that is intended to echo the early days of Christianity, when all the cardinals were pastors in Rome. O’Malley’s coat of arms now hangs above the church’s doorway, and he said he now visits and says Mass there, in Italian, about twice a year.