The former abbey church of Saint-Sernin in Toulouse - now known as the Basilica of Saint-Sernin - was built between about 1080 and 1120, and restored by French architect Viollet-le-Duc during the nineteenth century. The cartulary of the abbey, which contains copies of all the charters and records relating to the institution, was established between 844 and 1200, and transcribed by several copyists at the end of the twelfth century. It went missing for several centuries, but was rediscovered in 1885 by Celestin Douais (1848 1915), a priest and professor of ecclesiastical history at the...