Ashkanar

"You have to think things through. Ashkanar did exactly that. He had the foresight to conceal this for more than four hundred years."

- Gaius to Merlin

Ashkanar was a man who lived 400 years before Arthur's reign. He was responsible for hiding the last remaining dragon egg.

History
Ashkanar hid the last remaining dragon egg in a tomb meant for himself. To ensure the egg's safety, he divided the Triskelion that opened the tomb into three pieces and hid them in separate locations throughout Albion. He also designed the tomb with a number of traps, including poison gas and a trigger that caused the structure to collapse.

Four hundred years later, Merlin, Arthur, and the Knights of the Round Table tracked Julius Borden to the tomb. Merlin later retrieved the dragon egg from the tomb (causing it to collapse) and used his Dragonlord powers to hatch the dragon Aithusa (Aithusa).

Trivia

 * According to Gaius, Ashkanar's wealth and wisdom were without equal. The Druids also knew of legends describing him as a wise man (Aithusa).