Late 19th Century Patinated Spelter Relief Portrait Plaque of the Duke of Clarence.A Late 19th Century Patinated Spelter Relief Portrait Plaque of the Duke of Clarence in a turned wooden frame. Prince Albert Victor, Duke of Clarence and Avondale (1864 1892) was the eldest son of the Prince and Princess of Wales, later Edward VII and Queen Alexandra. Had he lived then the Duke of Clarence would have succeeded Edward VII to the throne. In 1891 he became engaged to Princess Victoria Mary of Teck, who would later marry his brother