The Nuttall Encyclopedia
The name given to pictures of the Virgin with the infant Christ, and more generally to all sacred pictures in which the Virgin is a prominent figure; the Virgin has been a favourite subject of art from the earliest times, the first representation of her being, according to legend, by St. Luke; different countries and schools have depicted their Madonnas, each in its own characteristic style; the greatest of all are the Sistine and Della Sedia of Raphael.
Wood, James, ed. Entry for 'Madonna'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/m/madonna.html. Frederick Warne & Co Ltd. London. 1900.