Vilgefortz
From Witcher Wiki
Vilgefortz of Roggeveen was a mage and a member of the Chapter of Sorcerers, described by Yennefer as "young" (which, among mages, meant "up to one hundred years"), but "incredibly talented".
In the Battle of Sodden Hill, he assumed command over mages of the Northern Kingdoms. After the battle he engineered the truce between Northern Kingdoms and Empire of Nilfgaard.
In fact he was, however, not only incredibly ambitious and power-hungry, but also secretly in friendship with Emhyr var Emreis, the Emperor of Nilfgaard. This began many years before the wars, when Emhyr was still hiding under the alias of Duny. Vilgefortz's thirst for unlimited power brought him to conclusion that he needs Ciri's, Duny's daughter's, blood to claim her powers as descendant of Lara Dorren.
On Thanedd Island, he was accused of treason and put in dimeritium shackles. However, due to actions of Tissaia de Vries he broke free and tried to capture Ciri (severely beating Geralt in the process), but she fled through the portal of Tor Lara. Afterwards he hid in his castle, still scheming to find and capture the girl.
He finally met his end in the hands of Geralt of Rivia.
Was the 'Master' of Rience and Schirrú, his secret apprentices and agents.
[edit] In The Witcher computer game
In the Prologue, Lambert says that Geralt has "killed a few (sorcerers) in (his) time", possibly alluding, amongst others, to Vilgefortz. Zoltan also invokes the name of Vilgefortz during a conversation with Geralt in Act II.
Elder Blood is an in-game book attributed to him.
At the end of Act V Azar Javed says:"This time you pissed into a tornado". This was a quote from Vilgefortz.
