Marzolo may have restored the "Madonna of Bogotá" painted by Raphael Sanzio of Urbino circa 1517. The Madonna keeps some resemblance to the Madonna of the Rose attributed to Raphael or Giulio Romano and is today at kept at the Prado Museum. Discovered by Santiago Martinez Delgado in his native city of Bogotá, the Madonna was taken to New York City and later to Chicago. However, there are doubts as to whom restored the said Madonna of if a copy was made. The two possible candidates for either one of them were Leo A. Marzolo and Sheldom Keck.[citation needed]