ROME A rarely seen painting by Italian master Caravaggio , part of a private collection, was put on display on Nov. 23 to the public for the first time in an exhibition in Rome . "The Portrait of Maffeo Barberini" features the future Pope Urban VIII, who hailed from the noble Roman Barberini family and was a friend of Caravaggio's patron. Born in 1568, wealthy humanist Barberini was elected in 1623 to the throne of Saint Peter, which he held until his death in 1644. The painting was