The Botticelli show at the Städel Museum in Frankfurt is the first big survey devoted to the artist in the German-speaking world.

Unrecorded and unfinished portrait by Rubens is up for auction and is worth up to £6m, but who is the lady with the determined chin?

13 etchings by Picasso have come to light after a Spanish professor discovered them in a book owned by the artist's muse, Dora Maar.