Фра Мауро
Two copies of maps by Fra Mauro are known to survive. One is a portolan chart in the Vatican Library, (Codice Borgiano V) published by Roberto Almagià in 1944. The other was recognized by Antonio Ratti as a copy signed by Giorgio Callapoda at Candia and dated 1541, of a lost chart by Fra Mauro, sold at auction in Milan in 1984 and now in a private collection, probably in France.