Regalia of the Grand Conqueror

Regalia of the Grand Conqueror 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:
 * Turalyon's Battlegear/Liadrin's Battlegear
 * Velen's Regalia/Zabra's Raiment
 * Kel'Thuzad's Regalia/Gul'dan'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.