Federico Zuccaro followed his elder brother Taddeo (no. 22) to Rome in the mid-1550s, and his long and productive career took him all over Italy and to the Netherlands, Spain and England. This is a study for a pair of allegorical figures in the vault of the Pauline Chapel in the Vatican. They are identified by the artist in his annotations Timor domini (‘Fear of the Lord’) to the left and fide (‘Faith’) to the right.