Leonardo da Vinci liked his Archangels.

The Angel Gabriel is portrayed in his painting of the Annunciation (Uffizi, Florence)

The Archangel Uriel appears with the Virgin and the infants Jesus and John the Baptist in the Louvre version of the Virgin of the Rocks.

Archangel Raphael accompanies Tobit on his journey in the painting titled Tobias and the Angel, attributed to both Andrea del Verrocchio and Leonardo (National Gallery, London)

It is said that Leonardo, portrayed as Tobias carrying a fish, painted the fine detail in the creature.

When Leonardo later painted The Annunciation, not only did he portray the Archangel Gabriel, but also referenced the Archangel Raphael.

The Raphael reference is a pointer to the fish painted by Leonardo in the Tobias and Angel painting. In The Annunciation painting it is formed by the shape of the hem of Gabriel’s white undergarment.