Picasso’s dealer

When she was four, Anne Sinclair had her portrait painted by Marie Laurencin. It is a charming picture, a little dark-brown-haired girl with a white bow, very blue eyes and a white and pink striped blouse, and it was commissioned by Sinclair’s grandfather, Paul Rosenberg, one of the handful of most influential Parisian art dealers of the 1920s and 1930s. More interested in politics than family history, Sinclair — for 13 years the host of the prestigious French weekly television news show 7 sur 7 — waited until she turned 60 to explore the trunks of papers in her mother’s attic. What she found was a remarkable archive of letters, bills, cuttings and telegrams, throwing light not only on her own family fortunes, but on the corruption and venality of the French art world during the years of German occupation and the Vichy government.

Paul Rosenberg was born in Paris in 1881, the son of a Jewish grain merchant from Bratislava who had emigrated to Paris and opened an antiques gallery near the Opéra.