Marriage record states he was from Reynosa. He established a ranch around 1750 at a site called “El Paraje de Dolores” six leagues from Reynosa.
In the confines of this town six ranches have been put in by some of the their residents Juan Rosas Longoria has his in the region of Dolores at a distance of about six leagues.

Other Source on Marriage: Juan Rosas Longoria de Aldape se casó el 6 noviembre 1745 Presidio Cohahuila con Maria Salome Cano Perez (hija de Juan Cano Rios y Maria Gertrudis Perez Lopez)

was born Abt. 1725 in Nuevo Leon, Mexico, and died 1758 in Reynosa, Tamaulipas, Mexico. He married MARIA-SALOME CANO-PEREZ 06 Nov 1745 in Presidio del Rio Grande, Guerrero, Coahuila, Mexico, daughter of JUAN CANO and MARIA-GERETUDIS PEREZ-LOPEZ. She was born Abt. 1730 in Caderyta Jimenez, Nuevo Leon, Mexico, and died in Reynosa, Tamaulipas, Mexico.

Protocolos de Cadereyta (Guillermo Garmendia Leal) page 29
February 1, 1759, Leg.2, Exp.11. Testamento de Juan Rosas Longoria, 2 fojas. vecino de Cadereyta, hijo legitimo de Joseph Longoria y Geronima de Aldaco. Hecho en el Paraje Santa Efigenia.
-Fui casado con Maria Salome Cano, Hija legitimas de Juan de Dios Cano y de Gertrudis Perez , tuvimos por hijos legitimos a:
Juan Antonio, Maria Gertrudis, y Juan Miguel

In the confines of this town (Reynosa) six ranches have been put in by some of their residents such as Don Diego de la Garza in the region called San Juan at a distance of two leagues, Francisco Ramírez in la Loma de Pajaritos at a distance of about five leagues, Juan Rosas Longoria has his in the region of Dolores at a distance of about six leagues, the reformed captain Don Carlos Cantú has it at a distance of three leagues which they call Las Lomas, Marcos González at a distance of two and one-half leagues in the region called Las Lomas; in them they each maintain all the livestock which they have, whose numbers and species are expressed in the respective items of each one of these settlers; one of them, who is Marcos González, other than maintaining his livestock there, has opened a small field into which a half measure of corn probably fit, and has also planted cantelopes, watermelons, and squash which grow in abundance.