Set of two heads from 'The Presentation of the Decretals'

A set of two prints reproducing the heads of two figures depicted in the fresco of 'The Presentation of the Decretals', painted to the right of the window on the south wall in the Stanza della Segnatura in the Vatican, also known as 'Jurisprudence Wall'. Each print is lettered along the bottom margin and numbered at top right. Probably from "Tetes choisies de personnages illustres..." published by Paolo Fidanza in Rome in 1785. 

Paolo Fidanza became famous for publishing six volumes of prints of heads after Raphael between 1757 and 1763.