Hannibus

Hannibus was the last of the Dragon Riders. It is known that the Dragon rider gloves and the Dragon rider boots once belonged to him. He was also the author of Last riders, which chronicled the rise and fall of his race, from being brought to Gielinor by Zaros, to their depletion to only five in number, until the eventual survival of only Hannibus himself.

According to Last riders, Hannibus rode a black dragon with three-heads, and considering where the book is found - and dropped - it is heavily suggested his mount was a King Black Dragon.