| Louis-Jean Levesque de Pouilly - Lieutenant of the inhabitants (1746-1751) | Initiator of the drilling project. |
| Jean-Gabriel Legendre - Architect of the square | Designed the scheduling of buildings. |
| Jean-Baptiste Pigalle - Sculptor of the monument | Author of the original statue of Louis XV. |
| Pierre Cartellier - Sculptor of the 1818 monument | Replaced the statue destroyed in 1792. |
| Daniel-Charles Trudaine - Director of Bridges and Chaussées | Supervised the development work. |
| Archevêque-duc de Reims - Opposing the project | Trying to block the construction. |