Career
The manuscript was sent to Rome, translated into Latin, and was then given to the young novice Giovanni Pietro Maffei (1533-1603) to prepare it for publication. Maffei added a considerable amount of text to Acosta"s work, entitled De Japonicis rebus epistolarum. This part contains abridged Latin translations of letters sent from the Jesuits working in Japan until the year 1564.
In his introduction Maffei congratulates Da Costa on his effort in summarizing the contents of the letters together in a short commentary.
The P. de Lequerica translated the same work into Spanish.