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,
