Rodrigo Ponce de Leon

Not the son of Antonio Ponce de León, XI duque de Arcos

Rodrigo was sent to exile in Argentina while brother Pablo was sent to Cuyo, Palawan in the Philippines

http://www.ebay.com/itm/Ponce-de-Leon-Argentina-History-South-Ameri...

https://books.google.com.ph/books?id=zzfWJRpCDAUC&pg=PP1&lpg=PP1&dq...

Disputed Origins

https://en.wikipedia.org/wiki/Antonio_Ponce_de_Leon_11th_Duke_of_Arcos

On 1 January 1778, he married Mariana de Silva-Bazán y Sarmiento, mother of the famous María Cayetana de Silva, 13th Duchess of Alba, with whom he had no descendants.

With his death on 13 December 1780, the first-born male line of the House of Ponce de León became extinct, and the House of Arcos was incorporated into the House of Benavente, and later to the House of Osuna.