Saints in Western painting: who they are, how they are recognised, and the works that depict them.
Matthew's angel, Mark's lion, Luke's ox, John's eagle — the evangelists identified by the creature beside them.

The Coronation of the Virgin with Saints Luke, Dominic, and John the Evangelist
Bartolomeo Passerotti

The Martyrdom of Saint Matthew
Caravaggio

Calling of Saint Matthew
Caravaggio

Saint Matthew and the Angel
Caravaggio

Inspiration of Saint Matthew
Caravaggio

The Basin of Saint Mark’s Square, with San Giorgio and the Giudecca, c.1774 (oil on canvas)
Francesco Guardi
Peter with the keys of the kingdom and Paul with the sword of his beheading, the two princes of the apostles.
Virgin martyrs carrying the instrument that killed them: Catherine's wheel, Barbara's tower, Lucy's eyes, Agnes's lamb.
Sebastian bound and pierced, and Roch showing his wound — the two saints a city prayed to when plague arrived.
Hermits in the wilderness with skull, book and tamed beast: Jerome, Anthony, Paul the Hermit, Mary of Egypt.
George on horseback, Margaret rising from the beast, Martha leading it on a cord — the dragon as defeated evil.
Caravaggio
Barbara Longhi

Enthroned Madonna, Saint Jerome, and St. Sebastian
Carlo Crivelli

Saint Jerome in Meditation
Caravaggio
Correggio