The Original Merlin

The original Merlin was a wizard and founder of the White Council. He is mentioned in Proven Guilty.

Proven Guilty
In Proven Guilty, it is stated that during the time of King Arthur he was custodian of the sword Amoracchius, becoming the first wizard of the White Council to have the honor and one of only two in history.

Turn Coat
In Turn Coat, he is believed to have created the White Council out of the chaos of the fall of the Roman Empire, though the White Council has existed in some form since pre-Roman Times.

Ebenezar McCoy is in possession of Merlin's journals among those of his mentor.

Changes
According to Ebenezar McCoy, Merlin was trained by Donar Vadderung. According to rumor, he won the Hidden Halls of Edinburgh from the lord of the Daoine Sidhe in a bet.

He is confirmed to having written the Laws of Magic.

No one is sure how Merlin made out in the end, but from his journals, he wasn't the kind to go in his sleep.

Cold Days
He is believed to have saved most of the critical texts from the Library of Alexandria as it burned down, and helped to create the Catholic Church to further preserve knowledge during the European Dark Age. However, many stories told about the original Merlin are believed to be apocryphal.

He created the magical prison Demonreach by building it once, at five different times, all at the same time, adding a failsafe, a fire that would kill the things imprisoned there rather than release them, whose name, according to Donar Vadderung, is "banefire".