The Horseman's Aegis

Of course, one of the most famous dragon riders was Oneiriss Targorot. She was the daughter of King Waymon and flew on her dragon along with her brothers and other men of her kind.
But in one of the battles her dragon died: the demon wizard threw a magic spear and pierced the heart of the lizard. Oneiriss miraculously survived falling into the ocean.
 
The girl was very attached to her pet, so she ordered to create a helmet in the form of her dragon to always carry the memory of him.
 
No one knows how true this legend is. However, dragon-like helmets are very popular among demons and humans today.