| Jean-Pierre Laffon (1787–1865) - Diocesan architect | Designer of the chapel (1827). |
| Henri Bach (1815–1899) - Architect of Saint-Étienne | Modified the ceiling (1890s). |
| Isarn de Lavaur (évêque 1071–1105) - Bishop of Toulouse | Reformed the canonial chapter. |
| Charles le Chauve - King of the Franks | Cita Santiago in 844. |
| Quitterie Cazes - Historian-archaeologist | Studyed the site (thesis, 1993). |