In Wrath of the Lich King it is item level 245, requires level 80 and is named Aegis Legguards. In MoP Classic it is item level 232 and requires level 80.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Conqueror's Aegis Legguards Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Conqueror's Aegis Legguards suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Conqueror's Aegis Legguards is part of the transmog set Conqueror's Aegis Plate (Paladin only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Conqueror's Aegis Legguards Fits
Other Items Named Conqueror's Aegis Legguards
1 other item in the current build is also called Conqueror's Aegis Legguards. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Conqueror's Aegis Legguards
Blizzard numbers items as they are created, so the named items next to ID 46176 (46171 to 46181) were usually added in the same batch as Conqueror's Aegis Legguards: the same quest line, zone, vendor or reward set.
Furious Gladiator's Frost WyrmID 46171 · Miscellaneous · item level 30"Teaches you how to summon this mount. This is a flying mount."