Hans Holbein the Younger
The Solothurn Madonna

1522
Museum of the City of Solothurn, Switzerland

The museum identifies the figure on the left as St. Martin of Tours; he has no attributes other than his episcopal garb and crozier. On the right is the St. Ursus the soldier who escaped the massacre of the Theban Legion but was later found in Solothurn and martyred there. His armor is of course the kind worn by contemporaries of the artist.

More of St. Ursus
More of St. Martin of Tours
More of portraits of Mary

Source: Wikimedia Commons