San Crisogono
Guercino was recommended by Marchese Enzo Bentivoglio to the newly elected Bolognese Ludovisi Pope, Pope Gregory XV in 1621. The years he spent in Rome, 1621–23, were very productive. From this period are his frescoes "Aurora" at the casino of the Villa Ludovisi, the ceiling in San Crisogono (1622) of "San Chrysogonus in Glory", the portrait of Pope Gregory XV (now in the Getty Museum), and the "St. Petronilla Altarpiece" for St. Peter's Basilica in the Vatican (now in the Museo Capitolini).