When Tenochtitlán was destroyed, Cortés sent a letter to the king in which he asked for, among other things, a corps of priests to Christianize the country. These arrived in 1524, along with the first Audiencia, later removed for corruption - and because the conquistadors felt their rights were being infringed by the imposition of royal order.
The first archbishop, Juan de Zumárraga, arrived in 1531, and was confronted with all the colony's exploitation and abuse of the Indians. It was then that a Mexica noble, Juan Diego, had a vision of the Virgin Mary atop a mountain formerly sacred to the Mexica mother-goddess, Tonantzin.
When the bishop demanded proof, Juan Diego returned to the Virgin (whom only he could see), who told him to go gather roses on the hillside, although it was neither the time nor the place for roses. He bore the roses back to the bishop in his tunic, and when he dropped them on the ground, he was surprised to see the bishop and retainers kneeling before him - a picture of the Virgin, complete with apocalyptic imagery (sun, crescent moon, and star), was painted on his clothes. This tunic is enshrined in the basílica de Guadalupe.
Story taken from the Catholic Encyclopedia.
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