[4] The Marquesado del Carpio was originally tied to the title of a Grande de España granted by King Philip II of Spain in 1559.

The title was bestowed upon Diego Lopez de Haro y Sotomayor on 20 January 1559 in recognition of his services to the crown,[5] however the Grandeeship may have been revoked or not inherited at some point along the line as another Grandeeship was conferred onto the Marquesado by King Philip IV of Spain in 1640 which was granted to Diego de Haro y Haro, 5th Marquess of Carpio and Count of Morente.

It is further unclear whether the first Marquess of Carpio was in fact Diego López de Haro y Sotomayor.

[7] What does appear clear is that Luis Méndez was indeed the 9th Señor del Carpio inheriting the title from his parents and that his son Diego López was also the Marques.

Luis Méndez inherited the Señorio del Carpio from his mother Beatriz Portocarrero Cárdenas in 1528 according to Margarita Cabrera Sánchez.