Emperor Marksus and the Dragon Knights of Aurndest
The first Dragon Knight to come to being was Emperor Marksus, during the Great Revolution. Dragon knights form a bond with their Dragon companions when the dragon is just a hatchling, this bond lasts a lifetime, if one dies, the other dies. These Dragon Knights are generals to Emperor Marksus, and must complete a ritual to solidify their Loyalty and create the pact with their Dragon Companion. In this contract with the Emperor, if the Knight ever betrays him they will forfeit their power and die.
In the world there are only a few dozen Dragon Knights including The Urthalre (the elites)