Буэн-Ретиро
Gaspar had the ambition to follow in his father's footsteps, but was frustrated in his ambitions. He was then suspected to be behind a plan to kill the King by blowing up the Buen Retiro Palace. As a punishment, he was sent to Portugal to fight the insurgents, where he was made prisoner after the defeat at Montes Claros. In 1677, he was rehabilitated and sent to Rome as ambassador, until July 1682. He then became Viceroy of Naples, then a Spanish possession, until his death in 1687.