- Ms. 426, The manuscript constitutes a collection of letters written by famous citizens of the Duchy of Urbino, as Guidobaldo dal Monte, Cardinal Francesco Maria dal Monte, Filippo Terzi, Omero Tortora, Giovanni de’ Tommasi etc.

Ms. 426, The manuscript constitutes a collection of letters written by famous citizens of the Duchy of Urbino, as Guidobaldo dal Monte, Cardinal Francesco Maria dal Monte, Filippo Terzi, Omero Tortora, Giovanni de’ Tommasi etc.