How else to explain the following, from Blackwell's A Companion to Philosophy in the Middle Ages, page 2: "Among the first scholastics of note were Roger Bacon (b.1214/20; d. ca. 1492) . . ."? The book's proper entry on Roger Bacon states, on page 616, that Bacon died about 1292. However the entry's first sentence is "The basic facts of Bacon's chronology are still in dispute."
Current hypothesis: Bacon found the philosopher's stone, faked his own death in 1292, lived another 200 years or so being awesome, then was lost at sea in the search for a western route to India and Cathay. Probably still living in Atlantis.
Or else the first date was a typo. Right? Right?