Three philosophers (prophets?) in conversation; behind them a putto holds a large book open, Ciro Ferri (Rome 1634 - 1689 Rome), drawing, chalk; stained paper, x cm, Lagoy; Moritz von Fries; mu Duke Albert of Saxe-Teschen, lower right in later ink 'Pietro Berettini da Cortona, 1596-1669

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