[1] Curiel was noted for his influence in European diplomacy and mercantile activity from the late 1550s.
[3] Curiel started his career between Madrid and Brussels, furthering trade for the Spanish Empire.
[5] In 1569, Curiel and Francisco de Ibarra attempted to tarnish the Duke's reputation in a report for the King.
[4][6] Whilst the report was being reviewed, Curiel was stabbed at night, surviving after an intensive recovery.
Curiel left Flanders to serve as the King's Agent in Paris, with little of the great influence that he had enjoyed in the Netherlands.