In Wrath of the Lich King it is item level 232, requires level 80 and is named Thrall's Legguards. In MoP Classic it is item level 245, requires level 80 and sells to vendors for 1c.
In the Appearances collection, Thrall's Legguards of Triumph is listed as Boss Drop. Appearance ID: 11828. 14 other items wear the same appearance; 12 of them are listed here.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Thrall's Legguards of Triumph Compares
Who It Suits
Mail is the armor type Evoker, Hunter and Shaman wear. With Agility or Intellect, Thrall's Legguards of Triumph suits Beast Mastery, Marksmanship and Survival Hunter; Elemental, Enhancement and Restoration Shaman; Devastation, Preservation and Augmentation Evoker.
Transmog Sets
Thrall's Legguards of Triumph is part of the transmog set Thrall's Garb (Shaman only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Thrall's Legguards of Triumph Fits
Other Items Named Thrall's Legguards of Triumph
1 other item in the current build is also called Thrall's Legguards of Triumph. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Thrall's Legguards of Triumph
Blizzard numbers items as they are created, so the named items next to ID 48303 (48298 to 48308) were usually added in the same batch as Thrall's Legguards of Triumph: the same quest line, zone, vendor or reward set.