In 1531 near Mexico City, the Virgin Mary miraculously appeared before Juan Diego, an Aztec converted to Christianity. She urged him to have the city's bishops build a shrine, but they did not believe Diego. The Virgin reappeared with roses, impossible to grow in winter, as proof. He showed the bishops the roses wrapped in his cloak, which was miraculously imprinted with the image of the Virgin. Mexicans still pilgrimage to the Basilica of Guadalupe on December 12 in honor of Mexico's patron saint, the Lady of Guadalupe.