The identification of the sitter is confirmed by comparison with portrait medals. Andrea Gritti (1455 - 1538) was elected Doge of Venice in 1523; the painting was probably made soon afterwards. The device on the ring represents the doge kneeling before Saint Mark, patron of Venice. The portrait itself may have hung near a religious image, for the Doge's attitude is one of dignified adoration.
The National Gallery, Trafalgar Square, London WC2N 5DN