Chiesa di Sant’Ignazio di Loyola, Church of St. Ignatius of Loyola, Rome, Italy

Andrea Pozzo, a Jesuit lay brother, painted the grandiose fresco that stretches across the nave ceiling (after 1685). It celebrates the work of Saint Ignatius and the Society of Jesus in the world presenting the saint welcomed into paradise by Christ and the Virgin Mary and surrounded by allegorical representations of all four continents.

Pozzo worked to open up, even dissolve the actual surface of the nave’s barrel vault illusionistically, arranging a perspectival projection to make an observer see a huge and lofty cupola (of a sort), open to the bright sky, and filled with upward floating figures. A marble disk set into the middle of the nave floor marks the ideal spot from which observers might fully experience the illusion.

A second marker in the nave floor further east provides the ideal vantage point for the trompe l’oeil painting on canvas that covers the crossing and depicts a tall, ribbed and coffered dome. The cupola one expects to see here was never built and in its place, in 1685, Andrea Pozzo supplied a painting on canvas with a perspectival projection of a cupola. Destroyed in 1891, the painting was subsequently replaced.

The chapel just to the right of the church’s presbytery (at the south-east corner) houses the funeral monuments of Pope Gregory XV and his nephew, Cardinal Ludovisi, the church’s founder. Pierre Legros and Pierre-Étienne Monnot made Gregory XV’s monument some sixty years after Gregory’s death.