In 1921, he married Montserrat Castro y Lombillo, who has been described as "arrogant in figure", being sponsored by the bride's mother and the groom's father, Count of Aguilar.
[1] De Aguilar was a tennis and field hockey player, winning several Spanish Championships of the latter with Athletic.
[2] In April 1919, when Julián Ruete resigned from the presidency of Atlético Madrid, de Aguilar was chosen to replace him.
[2][5] His mandate only lasted for one season because in 1920, he resigned upon being transferred to the Spanish Embassy in Belgium,[2] from which he collaborated in the organization of the 1920 Olympic Games in Antwerp.
On 1 April 1962, de Aguilar was granted the Order Civil of Agricultural Merit, with the category of Commander.