Anne of Austria, wife of King Louis XIII, vowed to God that she would build a magnificent church dedicated to the Virgin Mary if her next child was a boy – the son she bore was none other than the would-be sun god, King Louis XIV of France. When Anne’s husband died she became Queen-Regent for her six-year-old son Louis XIV, and commissioned Francois Mansart to design the great church on the grounds of the royal abbey. Mansart would eventually be sacked on account of his unforgiving temperament and the project was taken on by Jacques Lemercier