Galahad
From The Stargate Omnipedia
Knight who had once known the Ancient Merlin during the days of King Arthur's Round Table. It is presumed that he was a human from Earth, on whom the legend of Sir Galahad is based.
When SG-1 located and revived the Merlin from his stasis unit, he momentarily mistook Daniel Jackson for Galahad.
KEY EPISODE
The Quest, Part 2 - After a thousand years in an Ancient stasis unit, Merlin emerges believing he is surrounded by his old friends.