In 1511, his publications included the first historical account of the Spanish discoveries: "Opera, Legatio, Babylonica, Oceanidecas, Paemata, Epigrammata" (Seville, 1511). The "Decas" consisted of ten reports, two of which Martyr had previously sent as letters describing the voyages of Columbus, to Cardinal Ascanius Sforza in 1493 and 1494. In 1501 Martyr, as requested by the Cardinal Luigi d'Aragona, added eight chapters on the voyage of Columbus and the exploits of Martin Alonzo Pinzón. In 1511 he added a supplement giving an account of events from 1501 to 1511.