Aazhag was the former Chief of Tribe Threefinger until approximately a year ago, when he was murdered whilst at prayer shortly before a duel with Afzal Jabbar. Though Afzal did kill Aazhag, it is revealed through the events of A Gathering Storm that Moirin Mhic Macdha was mind controlling him at the time.
Aazhag had two sons, Wretch "Shadowborn", who he largely ignored and otherwise abused, and Zibrust, who he raised as his heir.
The Chief's last words were to Wretch, mistaking him for Zibrust "Zibrust... be my vengeance... My son... Shadowborn."