Aiimus, modeled after third century BC Greek arms and armor, is the protector of a sacred temple. He is charged with guarding the 'Chalice of the Angels' from any threat or damage. While he is an excellent guardsman, he is occasionally overzealous, and once drove back an envoy of priests who had come simply to see the chalice for themselves.
I did a fair amount of research for the sword and armor in this image. The greaves, shield and sword were all very Greek, but the chestpiece is borrowed from southern Spain, and around the same time period. Aiimus is a stoat, at least in the summer, for as you know, in the winter months their fur changes color to white, making him an ermine. He definitely prefers his summer colors better.