In Wrath of the Lich King it is item level 245, requires level 80 and is named Terrorblade Helmet. In MoP Classic it is item level 232, requires level 80 and sells to vendors for 1c.
Read from the World of Warcraft client build files.
How Conqueror's Terrorblade Helmet Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Conqueror's Terrorblade Helmet suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Conqueror's Terrorblade Helmet Fits
Other Items Named Conqueror's Terrorblade Helmet
1 other item in the current build is also called Conqueror's Terrorblade Helmet. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Conqueror's Terrorblade Helmet
Blizzard numbers items as they are created, so the named items next to ID 46125 (46120 to 46130) were usually added in the same batch as Conqueror's Terrorblade Helmet: the same quest line, zone, vendor or reward set.