Parents of Maria de la Merced Tiscareno

Hello everyone,

I'm looking for information on the parents of my 7th Great Grandmother Maria de la Merced Tiscareno. I'm not sure where or when Maria was born, but she married my 7th Great Grandfather Raphael Antonio de Cuellar on 12 May 1777 in Aguascalientes, so she was probably born around 1760. On the marriage certificate her parents are listed as Juan Joseph de Tiscareno and Maria Theresa de Altuna. They would've probably been born in the 1730s in the Aguascalientes area. I'm unable to find any information on them other than a baptism of one of their children. Any information on Juan Joseph de Tiscareno and Maria Theresa de Altuna or their parents would be greatly appreciated.

Thanks everyone.

Christopher de Cuellar