Philip de László (1869-1937), Portrait of Comtesse Jean de Castellane, née Marie Dorothée de Talleyrand-Périgord, other married name Fürstin Karl Egon IV zu Fürstenberg, 1899. Photo Jacqueline Hyde © de Laszlo Foundation

Philip de László (1869-1937), Portrait de la comtesse Greffulhe, née Caraman-Chimay, 1905.

Philip de László (1869-1937), Portrait d'Elaine, Duchesse de Guiche, née Greffulhe, 1905.

Philip de László (1869-1937), Portrait of Princess Max Egon von Hohenlohe-Langenburg, née María de la Piedad de Yturbe, 1906. Joaquín Cortés © de Laszlo Foundation.

Philip de László (1869-1937), Portrait of Princess Andrew of Greece and Denmark, née Princess Alice of Battenberg, 1907. A.C. Cooper © de Laszlo Foundation

Philip de László (1869-1937), Portrait of Countess Beatty, née Ethel Field; other married name Mrs Arthur M. Tree, 1911. Chris Honeywell © de Laszlo Foundation

Philip de László (1869-1937), Portrait de la comtesse Dénes Széchényi, née Émilie de Riquet, comtesse de Caraman-Chimay, 1911. Jacqueline Hyde © de Laszlo Foundation

Philip de László (1869-1937), Portrait of Winifred, Duchess of Portland, 1912.

Philip de László (1869-1937), Portrait de la comtesse Anna de Noailles, 1913.

Philip de László (1869-1937), Portrait of Edith Helen Vane-Tempest-Stewart, Marchioness of Londonderry, previously Viscountess Castlereagh, née the Honourable Edith Chaplin; wife of 7th Marquess, 1913. Bryan Rutledge © de Laszlo Foundation

Philip de László (1869-1937), Portrait of Countess Ferdinand Colloredo-Mannsfeld, née Eleanora Iselin, 1913 © Stefan Oláh / de Laszlo Foundation

Philip de László (1869-1937), Portrait of Viscountess Chaplin, 1915.

Philip de László (1869-1937), Portrait of Elinor Glyn, née Sutherland; married name Mrs Clayton Glyn, 1914. Roy Fox Fine Art Photography © de Laszlo Foundation

Philip de László (1869-1937), Portrait of Mrs. George Owen Sandys, née Dulcie Edythe Angela Redford, 1915. © Jack Loan.

Philip de László (1869-1937), Portrait of Mrs Philip de László, née Lucy Madeleine Guinness, 1918. Roy Fox Fine Art Photography © de Laszlo Foundation

Philip de László (1869-1937), Portrait of Elizabeth Bowes Lyon, wife of King George VI of England, mother of Queen Elizabeth II, 1925. Royal Collection © Her Majesty Queen Elizabeth II

Philip de László (1869-1937), Portrait of Lady Alastair Graham, née Lady Meriel Olivia Bathurst, 1925. Roy Fox Fine Art Photography © de Laszlo Foundation

Philip de László (1869-1937), Portrait of Queen Victoria Eugenia of Spain, née Princess Victoria Eugénie Julia of Battenberg; Consort of Alfonso XIII, 1927 © Museo del Prado, Madrid.

Philip de László (1869-1937), Portrait of Mrs Edmund Buchanan, née Doreen Marguerite Bury, 1929 © Antonia Reeve