Gaddo Gaddi (c. 1239, Florence – c. 1312, Florence) was an Italian painter and mosaicist of Florence in a gothic art style. Almost no works survive. He was the father of Taddeo Gaddi. He completed mosaics on facade of Santa Maria Maggiore in Rome. The "Coronation of the Virgin" mosaic over the inside door of Florence Cathedral, dated 1307, is also attributed to Gaddo Gaddi. Using only the above description and what you know about the world, "There are bound to be unknown works of the Italian artist Gaddo Gaddi that will be discovered some day." is definitely correct, incorrect, or inconclusive? 