| Leonardo Grosso della Rovere - Bishop of Agen (1487–1519) | Suspected commander of the tower. |
| Antonio della Rovere - Bishop of Agen (1519–1538) | Successor involved in construction. |
| Claude Joly - Bishop of Agen (17th century) | Describes the tower as a bell tower in 1668. |
| Georges Tholin - Local historian | Author of an article on the tower (1889). |
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