Honorius Augustodunensis (fl.1107-1140) was a popular German theologian and a prolific writer. The Catholic Encyclopaedia quotes the view that Honorius was one of the most mysterious personages in all the medieval period. In what is arguably his best known work, Imago Mundi, he expressed the view that Atlantis had been an island in the Atlantic. He wrote that that the ‘curdled sea’, assumed by Andrew Collins to be a reference to the Sargasso Sea[0072.91], “adjoins the Hesperides and covers the site of lost Atlantis, which lay west from Gibraltar.”
His Imago Mundi contained a world map, which has become known as The Sawley Map(b).
*(a) http://blog.metmuseum.org/penandparchment/wp-content/uploads/2009/07/sawley_map_with_overlay.jpg (link broken June 2018) See: https://web.archive.org/web/20171219025200/http://blog.metmuseum.org/penandparchment/wp-content/uploads/2009/07/sawley_map_with_overlay.jpg
(b) http://cartographic-images.net/Cartographic_Images/215_The_Sawley_Map.html (link broken Feb 2019) See: https://web.archive.org/web/20180324045356/http://cartographic-images.net/Cartographic_Images/215_The_Sawley_Map.html*