Grez-sur-Loing (French pronunciation: [gʁe syʁ lwɛ̃] , literally Grez on Loing; formerly Grès-en-Gâtinais, literally Grès in Gâtinais) is a commune in the Seine-et-Marne department in north-central France. Sights. The Church of Notre-Dame et Saint-Laurent (Church of Our Lady and of Saint Lawrence) was the church of a priory dependent on Saint Peter's Abbey in Sens. It dates from the twelfth century and houses some tombs of the sixteenth century. The Tower of Ganne, built by Louis VI the fat in 1127, at the same time as the castle.
https://en.wikipedia.org/wiki/Grez-sur-Loing