(1) The previous posting titled ""Spandrel (structural engineering) → Rib" had
Note (4) Rib Vault (architecture), Encyclopaedia Britannica, undated. https://www.britannica.com/technology/rib-vault
This page contains a link for "Romansque churches." Click it and you will the page "Romanesque Architecture,"
(a) whose text says in part: "Romanesque churches characteristically incorporated semicircular arches for windows, doors, and arcades; barrel or groin vaults to support the roof of the nave; massive piers and walls, with few windows, to contain the outward thrust of the vaults; side aisles with galleries above them; a large tower over the crossing of nave and transept; and smaller towers at the church's western end [which is usually the entrance].
(b) To the right of this text is a photo of barrel vault, with "Saint-Sernin."
introduction: "The current church is located on the site of a previous basilica of the 4th century which contained the body of Saint Saturnin or Sernin, the first bishop of Toulouse in c. 250. Constructed in the Romanesque style between about 1080 and 1120, with construction continuing thereafter, Saint-Sernin is the largest remaining Romanesque building in Europe. * * * In 1998 the basilica was added to the UNESCO World Heritage Sites under the description: World Heritage Sites of the Routes of Santiago [St James] de Compostela in France.
section 2 Features: "The ceilings are vaulted, unlike many of the earlier churches.
section 2.2 Interior: "The central nave is barrel vaulted; the four aisles have rib vaults and are supported by buttresses.
Down in the mid-page, there is a plan Basilica of Saint-Sernin -- with definitions. The Wiki page for the same has a plan, too -- absent any word. Only nave has chairs. The (four) aisles are empty (to walk through, even during church service).
Further down is a photo of the nave, with caption: "Basilica of Saint-Sernin, Toulouse, France, view of the nave toward the apse, c. 1080-1120 (photo: PierreSelim, CC BY 3.0)"