Lord Miraak

Miraak is the primary antagonist of Dragonborn, the third official expansion pack for The Elder Scrolls V: Skyrim. He is a mighty dragon priest who once ruled over the people of Solstheim and according to himself, locals of Solstheim and Hermaeus Mora, he is the first Dragonborn ever known.

In the Merethic Era, when the dragons were still dominating mortals on Nirn, Miraak lived as a dragon priest in Solstheim, an island located to the northwest of Morrowind and northeast of Skyrim. At some point before his death, he turned on his dragon masters by killing them and devouring their souls. Around the same time, he came under the service of Hermaeus Mora, the Daedric Prince of Knowledge and Fate. After his death, he started to live in Apocrypha, Hermaeus Mora's plane of Oblivion.

After the Dragonborn has completed their trial with the Greybeards, they get attacked by three cultists in a random city (most likely Riften). After killing the cultists and examining their bodies, the Dragonborn finds the orders given by Miraak to kill the "False" Dragonborn. They then travel to Solstheim to find the reason for this attack. There they come in contact with the Skaal, a clan of Nords native to the island. Their Shaman, Frea tells the Dragonborn that Miraak has started to take control over the people of Solstheim. The Dragonborn goes in a quest to cleanse the All-Maker Stones and find the Black Books of Hermaeus Mora. After reading the last Book, the Dragonborn is transported to Apocrypha where they defeat Miraak once and for all.

Trivia

 * His name in draconic language means "Allegiance-Guide".
 * Since he's a Dragonborn a well, he is capable of absorbing slain dragon's soul to regain his strength.
 * Unlike other dragon priests in the game, Miraak is not an undead and fights like a human.