Historical visit of the Commanderie Saint-Jean at 5pm by Philippe Salvon, local historian «Stones that speak: Discovering the tombstones of the Commanderie St Jean de Corbeil» at 6pm by Frédéric Gatineau, President of the Historical and Archaeological Society of Essonne and Hurepoix The Commanderie St Jean preserves a beautiful collection of tombstones including the famous cenotaph of Queen Ingueburge. The exceptional opening of the church will be an opportunity to (re) discover them and to be interested in the characters they honor.