I see Bible motifs. From left to right:
-Adam and Eve
-Palm Tree (either Garden of Eden or palms for Palm Sunday)
-Archangel Michael (with flaming sword and scales)
-Jesus and Mary
In the Shield:
-Beehive- I think this is for when Sampson found bees in the carcass of the lion from the book of Judges.
-Lamb
-Cherubs
It looks like it could be from a religious fraternity, depending on how the helmet looks as a whole. The letters in the center of the shield might help tell you more.