The origin of surname Osorio is very old and is related to the first nobility of Spain. The trunk of this lineage is Don Osorio is the equivalent of Don Suero, principal gentleman who lived in the reign of Don Rodrigo, the last monarch Godo, and the early years of the reign of Don Pelayo, which accompanied the restoration of Spain in 714 AD

The Knights of this lineage showed their nobility repeatedly in the military orders of Santiago, Calatrava, Alcantara and Charles III.

Don Pedro de Osorio was made Earl of Trastamara by Juan II in 1445, Don Antonio Maria Osorio was created in 1799 Marques de Torremejia.

He also holds the titles of Marquis of Astorga, Evening and San Roman.