[3][4][5][6][10] His paternal grandparents were Pedro Lascuráin and Dolores de Icaza y Jiménez del Arenal.

[4] Lascuráin then studied at the Escuela Nacional de Jurisprudencia (National School of Jurisprudence) in Mexico City.

As foreign secretary, he had to deal with the demands of Henry Lane Wilson, the United States ambassador to Mexico.

On 9 February 1913, a coup d'état to overthrew Madero, known as the Ten Tragic Days (Spanish: Decena Trágica), began.

[13] By the 18th, the pro-Madero general Victoriano Huerta switched sides and joined the coup, capturing Madero and part of his cabinet.

[14] Lascuráin was one of the people who convinced Madero to resign the presidency while he was being held prisoner in the National Palace and claimed that his life was in danger if he refused.

As well as Madero, Huerta had ousted vice president José María Pino Suárez and attorney general Adolfo Valles Baca.

Huerta called a late-night special session of Congress, and under the guns of his troops, the legislators endorsed his assumption of power.