Carlos Hipolito Saralegui Lesca was born in Buenos Aires. He was a volunteer during World War I in France. There, Lescat became a personal friend of Charles Maurras, leader of the Action française (AF) monarchist movement. Part of the AF, he also presided over the administration council of Je suis partout, and was editor in chief of this review for a time. In 1941 he published an anti-Semitic book titled Quand Israël se venge (When Israel takes revenge), through the Éditions Grasset publishing house.