Regalia of the Grand Vanquisher

Regalia of the Grand Vanquisher is a tier 9 armor token. It can be exchanged at Champion Isimode or Champion Faesrol at the Argent Tournament Grounds for the Heroic versions of the following tier set pieces:
 * VanCleef's Battlegear/Garona's Battlegear
 * Thassarian's Battlegear/Koltira's Battlegear
 * Khadgar's Regalia/Sunstrider's Regalia
 * Malfurion's Regalia/Runetotem's Regalia

Source
This item can be found in the Argent Crusade Tribute Chest after defeating Anub'arakin the 25-man version of Trial of the Grand Crusader.