The eastern end of Saint-Jean's church, containing the liturgical choir for the canonial community, was completed between the years c.1220-1240. The east end and the facade block stood separately for more than a century until the nave connected them in c. 1350-1400. The canons entered their choir through a separate door at the northern end of the eastern claustral gallery. That door was decorated with a remarkable sculpted tympanum (that still survives), carved with a scene of Christ's baptism by Saint John.