In Wrath of the Lich King it is item level 226, requires level 80 and is named Redemption Legguards. In MoP Classic it is item level 213 and requires level 80.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Valorous Redemption Legguards Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Valorous Redemption Legguards suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Valorous Redemption Legguards is part of the transmog set Valorous Redemption Plate (Paladin only). The other 16 pieces:
Items Numbered Next to Valorous Redemption Legguards
Blizzard numbers items as they are created, so the named items next to ID 40583 (40578 to 40588) were usually added in the same batch as Valorous Redemption Legguards: the same quest line, zone, vendor or reward set.