[Footnote 56: The merit of another, and apparently an original conjecture, belongs to Sismondi, who makes him the adulterous son of Bernardino, by one of Guidantonio's wives. For this there is no authority whatever; indeed, this historian, by confounding Guidantonio with his son, and omitting Oddantonio entirely, has utterly confused the family and history of Urbino. We have formerly set down Aura as daughter of Guidantonio, on authority of a licence from Nicholas V. for Federigo, his wife, and his sister Aura, to choose a confessor, quoted by Gallo Galli, and also in the MS. of Muzio (Vat. Urb. MSS., No. 1011), which is much fuller than the printed edition. Thus also Giovanni Sanzi, father of the painter Raffaele, in his rhyming chronicle of Federigo's life, which we shall frequently have to quote (Vat. Ottobon. MSS., No. 1305), and shall examine in our twenty-fifth chapter, says of him,-- "But others call this admirable flower Grandson of Guidantonio, being child Of that count's daughter, whose exalted name Is dear to virtue, Bernardino's wife Of th' Ubaldini."] It is very remarkable that the filiation of Federigo to the Ubaldini is adopted by a majority of those writers who lived under him and his son, giving colour to a conjecture that it may have been encouraged at their court as masking the flaw in their pedigree. This, however, is but an unsatisfactory explanation. His character and brilliant distinctions could well dispense with the honours of birth; and in this century, bastardy, so far from inferring a blot on the princely escutcheons of Italy, or presenting a bar to sovereignty, seemed, as in the dynasties of Este and Scala, as well as in the Malatesta, already referred to, to constitute a preference. But in order to explain his special affection for the Ubaldini, it has been supposed that his mother was of that stock, and that he was at first brought up by them, in deference to the jealousy of Countess Rengarda. This motive soon ceased by her death, when the infant was received and cherished in his father's palace. * * * * *