The name _Tumba_, as far as we know, belonged originally to Mont St. Michel in Normandy. There a famous and far better authenticated apparition of St. Michael is related to have taken place in the year 708, which led to the building of a church and monastery by Autbert, Bishop of Avranches. The church was built in close imitation of the Church of St. Michael in Mount Garganus in Apulia, which had been founded as early as 493.(91) If, therefore, William of Worcester relates an apparition of St. Michael in Cornwall at about the same date, in 710, it is clear that Mont St. Michel in Normandy has here been confounded by him with St. Michael’s Mount in Cornwall. In order to explain this strange confusion, and the consequences which it entailed, it will be necessary to bear in mind the peculiar relations which existed between the two ecclesiastical establishments, perched the one on the island rock of St. Michel in Normandy, the other on St. Michael’s Mount in Cornwall. In physical structure there is a curious resemblance between the two mounts. Both are granite islands, and both so near the coast that at low water a dry passage is open to them from the mainland. The Mount on the Norman coast is larger and more distant from the coast than St. Michael’s Mount, yet for all that their general likeness is very striking. Now Mont St. Michel was called _Tumba_ at least as far back as the tenth century. Mabillon, in his “Annales Benedictini” (vol. ii. p. 18), quotes from an ancient author the following explanation of the name. “Now this place, to use the words of an ancient author, is called _Tumba_ by the inhabitants, because, emerging as it were from the sands like a hill, it rises up by the space of two hundred cubits, everywhere surrounded by the ocean; it is six miles distant from the shore, between the mouths of the rivers Segia and Senuna, six miles distant from Avranches, looking westward, and dividing Avranches from Brittany. Here the sea by its recess allows twice a passage to the pious people who proceed to the threshold of St. Michael the Archangel.” “Hic igitur locus, ut verbis antiqui autoris utar, _Tumba_ vocitatur ab incolis, ideo quod in morem tumuli, quasi ab arenis emergens, ad altum SPATIO DUCENTORUM CUBITORUM porrigitur, OCEANO UNDIQUE CINCTUS, SEX MILLIBUS AB ÆSTU OCEANI, inter ostia situs, ubi immergunt se mari flumina Segia (Sée) et Senuna (Selure), ab Abrincatensi urbe (Avranches) sex distans millibus; oceanum prospectans, Abrincatensem pagum dirimit a Britannia. Illic mare suo recessu devotis populis desideratum bis præbet iter petentibus limina beati Michaelis archangeli.”