In Wrath of the Lich King it is item level 245, requires level 80 and is named Nightsong Headguard. In MoP Classic it is item level 232 and requires level 80.
Read from the World of Warcraft client build files.
How Conqueror's Nightsong Headguard Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Conqueror's Nightsong Headguard suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Similar Items
The 10 items nearest to Conqueror's Nightsong Headguard (item level 35) in item level among Armor > Leather, Head slot, from item level 32 to 37.
Items Numbered Next to Conqueror's Nightsong Headguard
Blizzard numbers items as they are created, so the named items next to ID 46161 (46156 to 46166) were usually added in the same batch as Conqueror's Nightsong Headguard: the same quest line, zone, vendor or reward set.