Da Vinci's original commission for his famous Madonna of the Rocks came from an organization known as the Confraternity of the Immaculate Conception, which needed a painting for the centerpiece of an altar triptych in their church of San Francesco Grand in Milan. The nuns gave Leonardo specific dimensions and a desired themeā??the Virgin Mary, baby John The Baptist, Uriel, and Baby Jesus sheltering in a cave. Although Da Vinci did as they requested, when he delivered the work, the group reacted with horror. The painting contained several disturbing "un-Christian" anomalies, which seemed to convey a hidden message and alternative meaning. Da Vinci eventually mollified the confraternity by painting them a second version of Madonna of the Rocks, which now hangs in London's National Gallery under the name Virgin of the Rocks. Da Vinci's original hangs at the Louvre in Paris.