In Wrath of the Lich King it is item level 232, requires level 80 and is named Liadrin's Greaves. In MoP Classic it is item level 245 and requires level 80.
In the Appearances collection, Liadrin's Greaves of Triumph is listed as Boss Drop. Appearance ID: 11819. 17 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 Liadrin's Greaves of Triumph Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Liadrin's Greaves of Triumph suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Liadrin's Greaves of Triumph is part of the transmog set Liadrin's Plate (Paladin only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Liadrin's Greaves of Triumph Fits
Other Items Named Liadrin's Greaves of Triumph
1 other item in the current build is also called Liadrin's Greaves of Triumph. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Liadrin's Greaves of Triumph
Blizzard numbers items as they are created, so the named items next to ID 48591 (48586 to 48596) were usually added in the same batch as Liadrin's Greaves of Triumph: the same quest line, zone, vendor or reward set.