Gaulli decorated the entire dome including lantern and pendentives, central vault, window recesses, and transepts' ceilings. The original contract stipulated the dome was to be completed in two years, and the remainder by the end of ten years. If it met the approval of a panel, Gaulli was to be paid 14,000 scudi plus expenses. Gaulli's main vault fresco was unveiled on Christmas Eve, 1679. After this, he continued frescoing of the vaults of the tribune and other areas in the church until 1685.