| Louis-Pierre Baltard - Architect | Author of the first viable plans (1827). |
| Weil - Engineer and architect | Project selected in 1839, inspired by Baltard. |
| Chevillet - Architect | Finished the work after Baltard. |
| Marquis du Roure - Former owner of the castle | Selled the castle to the city in 1842. |
| Préfet Barante - Prefect of the Ardèche | Inaugurated the palace in 1847. |
| Évêque Guibert - Bishop of Viviers | Participated in the inauguration of 1847. |
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