Giovanni da Milano The birth of the virgin, 1365, Rinuccini

About author:

Giovanni da Milano (Giovanni di Jacopo di Guido da Caversaccio) was an Italian painter, known to be active in Florence and Rome between 1346 and 1369. His style is, like many Florentine painters of the time, considered to be derivative of Giotto's. Vasari misidentified him as a student of Taddeo Gaddi, a noted Giotto protégé.

Reference
http://en.wikipedia.org/wiki/Giovanni_da_Milano