
Medal (dated 1611, by F. A. Casoni) depicting two sides of the Bolognese painter Lavinia Fontana. The reverse legend: PER TE STATO GIOIOSO MI MANTENE (“because of you I am in a constant fervor”). Credit: Dr Busso Peus Nachfolger
Well, this certainly is unexpected. Just announced in Sweden by the renowned Uppsala Auktionskammare is the rediscovery of a brilliant example of Boncompagni patronage of the arts. It is a 1594 portrait by none other than Lavinia Fontana (1552-1614).
Fontana’s subject? Costanza Sforza of Santa Fiore (1560-1617), wife of the Duke of Sora, Giacomo Boncompagni (1548-1612). Giacomo himself was the legitimated son of Ugo Boncompagni = Pope Gregory XIII (1505-1572-1585). So at the time of her marriage in 1576—at the Apostolic Palace in the Vatican, with the whole College of Cardinals in attendance—Costanza Sforza found herself in the unusual position of daughter-in-law to a reigning Pope.

