| Victor-Emmanuel II - King of Sardinia | Sponsor and poser of the first stone. |
| Adélaïde de Habsbourg-Lorraine - Queen of Sardinia | Presented at the laying of the first stone. |
| Pierre-Louis Besson - Initial architect | Author of the first plans of the palace. |
| Pierre Spurgazzi - Piedmontese engineer | Reprinted and finalized the plans. |
| Pierre Eugène Montézin - Parisian painter | Author of the fresco (1939). |
| Napoléon III - Emperor of the French | Provides a chart to the Court of Appeal. |
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