Dragonkin (A Tail of Two Cats)

Dragonkin were a race that were fought by Robert the Strong.

The dragonkin were not immortal, but as close to immortal as a mortal could be. As a result of their mortality, Robert the Strong was able to fight the dragonkin to extinction.

Along with being mortal, dragonkin could not reproduce. To protect themselves and carry on their lineage they created a race of weaker clone beings that could reproduce... those clones are known today as Dragons.

If you do A Tail of Two Cats you will see a movie of Robert the Strong "beating" dragonskin.