At the sides of the altar in the sacristy of the Santa Maria della Salute, there are eight tondi by Tiziano, painted originally for the monastery of Santo Spirito. They portray the Four Evangelists: St Matthew, St Mark, St Luke and St John, as well as the Doctors of the Church: St Jerome, St Augustine, St Ambrose, and St Gregory the Great.Titian worked on an oak base with dense brush strokes. St Matthew represents the artist's self-portrait.