Read from the World of Warcraft client build files.
How Valorous Siegebreaker Battleplate Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Valorous Siegebreaker Battleplate suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Valorous Siegebreaker Battleplate is part of the transmog set Valorous Siegebreaker Battlegear (Warrior only). The other 16 pieces:
Items Numbered Next to Valorous Siegebreaker Battleplate
Blizzard numbers items as they are created, so the named items next to ID 45429 (45424 to 45434) were usually added in the same batch as Valorous Siegebreaker Battleplate: the same quest line, zone, vendor or reward set.