| Frédéric II - Emperor of the Holy Empire | Ordained the first fortification around 1230. |
| Woelfelin - Imperial Baill | Directed the construction of the first enclosure. |
| Jacques Tarade - Military engineer | A student of Vauban, supervised the work of 1675. |
| Vauban - Commissioner-General for Fortifications | Modified the plans in 1678. |
| Jean Uhlberger - Architect | Directed the fourth enclosure (1505-1559). |
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