Alberto Valdés
Born in Mexico City , he won a gold medal riding his horse Chihuahua in the show jumping competition for the Mexican team along with Humberto Mariles and Rubén Uriza at the 1948 Summer Olympics in London . 
<triplet> Humberto Mariles <subj> 1948 Summer Olympics <obj> participant in <triplet> Rubén Uriza <subj> 1948 Summer Olympics <obj> participant in <triplet> 1948 Summer Olympics <subj> 1948 <obj> point in time