Thesis Director, Professor Emeritus, Grenoble Alpes University, Bernard Emmery, author of "les moines petrifiés" will propose a conference entitled Loco qui nomen Theopoli: le mythe de la Cité de Dieu"by reference to Pierre Écrite, where remains inscribed in the rock of the parade of the same name, a Latin text dating from the 5th century of the Christian era. (site classified by decree of 10 March 1909)