The family retained a sense of belonging to Spain, and on 3 January 1676 Suasso's father received from Charles II of Spain the title of Baron d'Avernas le Gras in recognition of his diplomatic services.
In 1696, Guadas became a parish seat, thanks to a charter from King Charles II.
The Guerra Manuscript is an important musical manuscript copied by the nobleman and scribe José Miguel de Guerra y Villegas for the capilla real of Charles II of Spain around 1680.
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Charles II of Spain awarded him the Order of Alcántara in 1676 and appointed him to the Consejo de Órdenes.
Ponce de Leon was said to have named the island for Maria Anna von der Pfalz-Neuburg, the queen of Charles II of Spain, the sponsor of his expedition.
The ceiling of the main room is decorated by a magnificent fresco by the Italian artist Luca Giordano, painted around 1696–1697 for King Charles II of Spain and depicting The Apotheosis of the Spanish Monarchy.
While he lived in Spain, King Charles II granted him the title of Duke of Baños, and he served in the Spanish army, both in the Catalonia and in the Flanders campaigns.
In 1679, he was sent to Paris with his brothers Gaspar and José to take the newly crowned Queen Marie Louise of Orléans her bridal gifts which consisted of a painting by Juan Carreño de Miranda of Charles II of Spain.