Mona Lisa
Although the sitter has traditionally been identified as Lisa del Giocondo, a lack of definitive evidence has long fueled alternative theories, including Leonardo's mother Caterina in a distant memory and glorified as the Virgin Mary as the painting’s subject. According to this theory, at the time that Leonardo painted the portrait of his mother, whom he adored, she was not among the living. She died in 1495. The idea is that she was alive in Leonardo's imagination. Lisa del Giocondo's job was to be the model only.