| Filippo Nicolis, comte de Robilant - Architect and military engineer | Design designer in 1776. |
| Gio Francesco Fedele - Entrepreneur | Responsible for the work in 1776. |
| Jean-François Michaud - Engineer | Work supervisor until 1780. |
| Intendant Mattone - Chief Executive Officer | Order the addition of the pavement in 1779. |
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