In the early 1550s, Titian made a portrait of A Lady and her Daughter, which he left unfinished. Soon after the master’s death in 1576, Titian’s black-sheep son, Pomponio, had the scene of the mother and her daughter painted over, turning it into Tobias and the Angel: a religious subject was more likely to sell than a portrait of two anonymous sitters. This was the start of an incredible journey for the artwork. Today, after almost twenty years of scraping down, removing the overpaint millimetre by millimetre, the portrait which had been concealed for centuries finally emerged.