Of Stormwind is a title awarded to Alliance players upon completing 
[Exalted Champion of Stormwind], which requires the player attain exalted status with Stormwind and earn the right to represent Stormwind in the Argent Tournament.
Human characters can obtain this title by completing [25-30] The Valiant's Challenge. Characters of other Alliance races must complete their version of The Valiant's Challenge, then complete 
[25-30] A Valiant of Stormwind.
Patch changes[]
Patch 3.1.0 (2009-04-14): Added.
