It has also been suggested that Duarte Pacheco Pereira may have discovered the coasts of Maranhão, Pará and Marajó island and the mouth of the Amazon River in 1498, preceding the possible landings of the expeditions of Amerigo Vespucci in 1499, of Vicente Yáñez Pinzon in January 1500, and of Diego de Lepe in February 1500; and the Cabral's expedition in April 1500, making him the first known European explorer of present-day Brazil. This claim is based on interpretations of the cipher manuscript "Esmeraldo de Situ Orbis", written by Duarte Pacheco Pereira, which gives the following brief account: