Cuevas Family Genealogy Forum
I went to www.google.com and used that search engine.
I typed in: Cuevas Genealogy Spain. There was a slew of urls with those words in. One particularly I was impressed with. Go look at this url: www.geocities.com/~tfboettger/research/spangen.htm
It shortly mentions the titled mother of the Marquis George De Cuevas. Next I'm going to do a google search on the "Genealogies in the collection of T.F. Boettger" KINGDOM OF SPAIN. I have gotten nowhere with my Cuevas reseach because I don't have my computer. Use daughter's on the weekend when I go to see her for the weekends.