Agnolo Bronzino
The Holy Family with the infant Saint John The Baptist (Madonna Stroganoff). Early 1540-s

On the stone to the right the remains of a signature can be seen: BR[jnzin]O FIOR.

The pose of the Madonna can be traced back to Michaelangelo's Tondo Doni (Uffizi Gallery, Florence). Infrared examination of the picture has made it possible to identify major changes by the painter at the level of the preliminary drawing, particularly in the central part of the composition. These apply to the hands of Christ and John the Baptist and also to the foot of the Madonna.

About restoration
Go to the full description on "Italian painting in VIII-XX centuries" catalogue

Agnolo Bronzino