His son Alfonso Téllez-Girón de las Casas was elevated to Count of Ureña in 1464 by King Enrique IV of Castile.

Another celebrated member was Pedro Téllez-Girón, 9th Duke of Osuna and his wife María Josefa Pimentel, 12th Countess-Duchess of Benavente, who were among the most prominent patrons of the painter Francisco José de Goya y Lucientes.

He represented Spain in the crowning of Queen Victoria in England and in the marriage in 1853 of Spanish aristocrat Eugenia de Montijo to Napoleon III.

When Mariano died in 1882, aged 68, there were lawsuits from pretenders supposed to be closely connected to the family, as well as creditors racing many of the buildings, castles, lands, artworks, etc.

Closer inspections around many of the accumulated nobility titles reveal that they are held now by rather ambiguous persons (legally speaking about their supposed inheritance rights).