A member of the six
It's very likely that he's one of the members of The Six, the ruling council of the Kirin Tor. This is due to his location, the Violet Citadel, standing next to Rhonin and Archmage Modera. Also the Horde district, Sunreaver's Sanctuary, is named after him. This refers to his high position in the Kirin Tor. Perhaps he even succeeded Kael'thas as a blood elven member of the six.