Source Prince de Condé – Sources Wellington, Tonnelet and Marie Henriette During four centuries there was a fierce competition to gain a monopoly on the exploitation of the sources of Spa. Our walk took us to the Source Prince de Condé. Digging a hole in his basement, the owner of the building siphoned off water from the source Peter the Great. From there we walked to the abandoned source Wellington, an early competitor of the Compagnie Fermière des eaux de Spa, Spa Monopole’s predecessor. In 1921 that company gained exclusive exploitation rights of the city, as well as the licence to run the thermal baths and the exclusive right to us the name of the city to brand its bottled water. A short distance from Wellington we pass by Source Tonnelet and Source Marie-Henriette, sources that provide the mineral water for the thermal baths, former and current.