Question: When is Blanca Errázuriz's husband's birthday?
Sentence (from "Blanca Errázuriz"): Blanca Elena Errázuriz Vergara (9 April 1894 – 20 March 1940), also known as Bianca de Saulles, was a Chilean socialite and the former wife of football player and businessman John de Saulles.
Relevant evidence: Yes