The public meetings of the great oecumenical council (1431-1449) were held in the choir, while the committees sat in the chapter-house.
Though the precise locality is occasionally uncertain, the majority of the medieval synods assembled in the chapter-house of old St Paul's, or the former chapel of St Catherine within the precincts of Westminster Abbey or at Lambeth.
The chapter-house contains a pre-Reformation library which includes some valuable MSS.
The chapter-house, a magnificent ornate building, was built during the same period.
The beautiful cloisters on the south side of the cathedral, and the chapter-house beyond them, as well as the old churches of San Saturnino (Gothic) and San Nicolas (Romanesque), are also of interest to the student of architecture.
