The Gesù—a single-aisle, Latin-cross-plan church with side chapels and a dome over the crossing of the nave and the transepts—became the archetype of many Catholic churches built in the Baroque period and was the source of the so-called Jesuit style of architecture. On the nave ceiling is a fresco—The Triumph of the Name of Jesus, executed in 1678–79 by Giovanni Battista Gaulli, also known as Baciccio—that is one of the masterpieces of Baroque decorative painting.