In Wrath of the Lich King it is item level 245, requires level 80 and is named Siegebreaker Greathelm. In MoP Classic it is item level 232 and requires level 80.
Read from the World of Warcraft client build files.
How Conqueror's Siegebreaker Greathelm Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Conqueror's Siegebreaker Greathelm suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Conqueror's Siegebreaker Greathelm Fits
Other Items Named Conqueror's Siegebreaker Greathelm
1 other item in the current build is also called Conqueror's Siegebreaker Greathelm. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Conqueror's Siegebreaker Greathelm
Blizzard numbers items as they are created, so the named items next to ID 46166 (46161 to 46171) were usually added in the same batch as Conqueror's Siegebreaker Greathelm: the same quest line, zone, vendor or reward set.