| Jean II de Castelnau-Caylus - Baron and chamberlain of Louis XI | Founder at the origin of the college. |
| Jacques de Castelnau - Baron de Castelnau, son of John II | Sponsor of construction in 1507. |
| Louise de Bretagne-Avaugour - Châtelaine and lady of honour | Changed the dedication to Saint Louis. |
| Guy Ier de Castelnau-Clermont - 17th Baron of Castelnau | Husband of Louise de Bretagne-Avaugour. |
| Cardinal François Guillaume de Castelnau - Archbishop of Auch | Aura brings Italian artists. |
| Louis de Castelnau de Clermont-Lodève - Baron in the 17th century | Beneficiary of the retable of 1663. |
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