Louis XIV having had the Parlement of Rennes transferred to Vannes in 1675, the councillors had private mansions built there, villas then attracting many building workers.
He married Jeanne Caillot, the daughter of one of his companions with whom he settled at the Manoir du Grador and had many children.
In particular, he was ordered plans for the steps of the old town hall (currently the staircase at the Hôtel de Limur [fr]), as well as the redevelopment of the canal towards the port.
René-Charles de Coëtlogon, attorney general-syndic, decided to build a new castle and called on Olivier Delourme as architect, designer and director.
The Hogguer family of St. Gallen, in Switzerland, traders in paintings and finances, investing in Lorient in the French East India Company, called on Olivier Delourme to rebuild Kerguéhennec.