The Sorcerer

The Sorcerer was a nameless and corrupt sorcerer living in the land of Daventry. He wears the pointed hat signifying him as a member of the Magician's Guild.

Background
He once claimed to to have cast a spell on Edward's wife allowing her to bear a child. All he asked in return was the Magic Mirror. He hadn't kept his word, and Daventry suffered from a drought because it no longer had the mirror to foretell the future. He later hid the mirror with a dragon in the land.

Later on Graham would run into the Sorcerer during his search for the three treasures of Daventry. The Sorcerer would try to cast the Paralysis Spell on Graham, freezing him in place for a few minutes.

Graham thought that the enchanter he encountered during his adventure in Kolyma might have been the same invidual.

Behind the scenes
As hinted in the King's Quest Companion, mainly 1st and 2nd Edition, this character is apparently seen in KQ2, and may also possibly be Manannan, the brother of Hagatha, as all three characters are noted for wearing the pointed hat and being members of the Magician's Guild. If so this may further explain his reasons for kidnapping Alexander (avenging the loss of the mirror, and his sister loss of Valanice).