Dom Jacob Curiel (26 September 1587 - 3 April 1664), known by his alias Dom Duarte Nunes da Costa, was a Sephardi Jewish merchant, diplomat, and nobleman.
[3] Around 1620 he lived in Florence, where his son Moses Curiel was born.
Until 1640 he served as Agent to the Iberian Union, but then choose for the Portuguese Crown.
[4] On 14 June 1641 Jacob Curiel was ennobled by John IV of Portugal.
[5] In 1645 his son Moses Curiel was appointed as Agent of the Portuguese Crown in Amsterdam.