Only one tamed ancient wyrm was known to exist in recent years, the magnificent ORDER on the Atlantic shard. ORDER was a black ancient wyrm, tamed long long ago by Azaroth, founder of the United Tamers of Britannia.
Several ancient wyrms were tamed long ago, after a mistake in a certain update made them tamable. In the months following, almost all of them were lost to GM deletion or death. ORDER, however, lived on for years. His caretakers kept him safe and rarely took him far beyond the stables. GM's knew of the creature, but never would delete it as they knew its power was not being abused.
ORDER no longer exists on Atlantic. He was not deleted by the GM's, as is commonly thought. Rather, he passed away peacefully in the stables, several months before the edict proclaiming tamed ancient wyrms illegal.