A physician who lived in Lisbon in the first half of the sixteenth century. In 1539 he succeeded Duarte de Paz as representative of the Portuguese Maranos at Rome, charged with the mission of endeavoring to prevent, or at least to postpone, the establishment of the Inquisition in Portugal. For this purpose certain sums of money were entrusted to him, but he used them for obtaining papal briefs of protection for himself andhis family. Diogo was succeeded in office by his brother Hector. See ANTONIO, HECTOR.