Taliesen

Taliesin is a member of the Crows, a renowned assassin's guild operating out of Antiva.

Involvement
If Zevran Arainai's life was spared and he was recruited into the team, the Warden is ambushed by Taliesin and his men on the way to the Arl of Denerim's Estate. Taliesin reveals that he has come to look for Zevran, having volunteered to track the rogue assassin down on the Crows' behalf. If Zevran is not in the current party at the time of the encounter, he will appear to address his former comrade.

Taliesin offers Zevran the chance to return to the Crows, prepared to concoct a story to cover for his long absence. However, to do this they would have to finish Arainai's original mission and kill the Warden. At this point Zevran may turn on the player if his approval is not high enough (+33 or at least "Interested" in a romantic involvement), and he will be permanently killed in the following confrontation.

If Zevran's disposition towards the Warden is high, he will remain good on his oath and decline Taliesin's proposal. He says farewell to Taliesin, declaring he is saddened it has come to this as they were "friends once, and more". Depending on the Warden's dialog options, Zevran may either stay to fight alongside the Warden or refuse to draw swords against his old companion (If he was in the active party, he will leave until the fight is over).

Trivia
Taliesin seems to speak with a Cockney accent, similar to that of many residents of Ferelden. It is far removed from Zevran's, which may suggest he is not native to Antiva.