The south portal, or Portal of the Virgin, dates to about the 1220s, the same time as the Pillar of the Angels and the Astronomic clock in the interior. Decrees of the Emperor rendering justice were traditionally read out in front of this doorway. The rounded arches of tympanum over the doorway contain sculpture of the Virgin Mary dying, surrounded by the Twelve Apostles and being crowned by Christ. The original statue-columns of the Apostles from the 1220s which supported the tympanum were smashed in 1793 during the French Revolution.The mid-level of the transept over the portal, built in about 1230, has lancet windows and a statue of Virgin, flanked by Saint Peter and Saint Lawrence.

Above this is a colourful clock with the signs of the zodiac. Above this is a flamboyant Gothic balustrade with an original sundial from about 1493, and above that are two small rose windows from the same period.Following their destruction during the French Revolution, several of the sculptures have been replaced in the 19th century by works by Philippe Grass,Jean-Étienne Malade, and Jean Vallastre.