On December 9, 1531, a native Mexican named Juan Diego rose before dawn to walk fifteen miles to daily Mass in what is now Mexico City. Juan lived a simple life as a weaver, farmer, and laborer. That morning, as Juan passed Tepeyac Hill, he heard music and saw a glowing cloud encircled by a rainbow. A woman's voice called him to the top of the hill. There he saw a beautiful young woman dressed like an Aztec princess. She said she was the Virgin Mary and asked Juan to tell the bishop to build a church on that site. She said, "I vividly desire that a church be built on this site, so that in it I can be present and give my love, compassion, help, and defense, for I am your most devoted mother . . . to hear your laments and to remedy all your miseries, pains, and sufferings."
Verbiage from Catholic Online