You need to provide the image.

This is just visually based, and a weird shot in the dark, but it reminds me of images of Ashur/Asshur, who often has a bow and arrow in a circle with wings. http://www.askwhy.co.uk/judaism/asshur01.jpg But that is a very weird thing to be on a cathedral.

I bet if you post it in /r/whatisthisthing , you'll get your answer. They're amazing over there

Spanish Republican Air Force anti aircraft division