In one of this author's novels, Roberto de la Grive becomes marooned with his alter ego Ferrante on 
In one of this author's novels, Roberto de la Grive becomes marooned with his alter ego Ferrante on an island across the International Date Line. In addition to The Island of the Day Before, this author wrote a novel about Belbo, Diotellavi, and Casubon, who work for a publishing company and create a worldwide conspiracy theory about the Knights Templars. This author wrote a novel about investigations of murders in an Italian monastery by Adso of Melk and William of Baskerville. For 10 points, identify this author of Baudolino, Foucault's Pendulum, and The Name of the Rose.
In one of this author's novels, Roberto de la Grive becomes marooned with his alter ego Ferrante on an island across the International Date Line.
Umberto Eco