École ROMAINE vers 1600. Portrait de Pape, peut-être Grégoire XIII. Sanguine. D. : 18,5 × 14 cm. Annoté " Guercino " en bas à gauche. (Dessin doublé, petites tâches). Le pape Grégoire XIII, né Ugo Boncompagni (1502 - 1585), est élu pape le 25 mai 1572.

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