He was the son of José de la Riva Agüero, Marquess of Montealegre de Aulestia, first President of Peru, and the Princess Caroline Arnoldine Looz Corswarem.
Alexandre Quarles van Ufford (1956) and his progeny are members of Belgian nobility since 1992.
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In 1988, he was awarded an honorary doctorate at the Catholic University of Louvain, and in 1991, was raised into the Belgian nobility by King Baudouin with the hereditary title of Count Harmel (Dutch: graaf Harmel).