The title is
provided by a label at the church. Since 745 Roman Catholics have
been forbidden to reverence any named angels other than Gabriel,
Raphael, and Michael, so it is likely that those are the three depicted
here. Leaning on his pilgrim staff, the figure in the center
would be Raphael, who accompanied Tobias on his journey in the Book of
Tobit. The lilies could identify Gabriel, the angel of the
Annunciation, representations of which commonly feature a vase of lilies
representing Mary's virginity.
But that would make
the figure on the right St. Michael, who is almost universally
portrayed in armor.
Perhaps the label is
in error and the third figure is a saint.