During Advent in the year 1531 the Blessed Virgin Mary appeared to a native Mexican, St. Juan Diego, and asked him a favor. She sent him to the bishop with a request to have a Catholic church built on the hill where she was appearing in present-day Mexico City. She left her image emblazoned on Juan Diego's tunic, called a tilma. This miraculous image convinced the skeptical bishop and made an incalculable impact on the evangelization of the Americas, an impact that continues to resound and spread even today.These events, and that impact, are the subject of this Advent Retreat Guide: A Woman Clothed with the Sun.