It is further unclear whether the first Marquess of Carpio was in fact Diego López de Haro y Sotomayor. Some sources record Diego López as the I Marques and others record Diego López' father Luis Méndez de Haro y Sotomayor as the I Marques. 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. Whether the title was conferred upon the 9th or 10th Señor del Carpio appears to be the main question. Luis Méndez inherited the Señorio del Carpio from his mother Beatriz Portocarrero Cárdenas in 1528 according to Margarita Cabrera Sánchez. If the date of the upgrade to a Marquesado is accurately put at 1559, it would seem that the first Marques of Carpio was indeed Diego López de Haro y Sotomayor which is backed by the Real Academia de la Historia.
