The next step would be to find a good gazeteer (hmmm...I really need one at home!) and check to see if there are records for him in a Parish near Fuentesauco.

Another option is to write a letter of inquiry to the
church in Spain and see if they would help, but that is
not always fruitful.

Neither of these options is going to be a "quick fix," but be patient and persistent and it will probably pay off for you. I just had a couple extra minutes at the Library last evening, and saw your posting and wanted to try to help. I thought it would be fun to just "find it" and post it for you here, but alas, nothing in the two places I could check.

Do not worry that you haven't gotten back as a "client"
It's nice that you continue to let others know that I am here and willing to put my time into helping them. Wish my husband were independently wealthy and I could just do this for free all of the time.

Keep in touch,
Susan