Leonardo da Vinci (1452–1519), Portrait of Cecilia Gallerani (‘The Lady with an Ermine’), about 1489–90, oil on walnut, 54.8 x 40.3 cm, Property of the Czartoryski Foundation in Cracow on deposit at the National Museum in Cracow. © Princes Czartoryski Foundation

Leonardo da Vinci (1452–1519), Portrait of Cecilia Gallerani (‘The Lady with an Ermine’), about 1489–90, oil on walnut, 54.8 x 40.3 cm, Property of the Czartoryski Foundation in Cracow on deposit at the National Museum in Cracow. © Princes Czartoryski Foundation