Matisse Odalisque restored to the Rosenberg family

The contribution was in recognition of the Frick's role in hosting the gallery's anniversary show

This month, the New York gallery celebrates its sesquicentennial with an exhibition on its most famous paintings and clients

Major show of political art dominates at John Weber Gallery, and there is also a new group of Rauschenberg’s (this year’s flavour) and Beckmann, Barlach, Lehmbruck and Constable on offer