Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
Where Helm of the Shadowy Conqueror Fits
Other Items Named Helm of the Shadowy Conqueror
2 other items in the current build are also called Helm of the Shadowy Conqueror. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Helm of the Shadowy Conqueror
Blizzard numbers items as they are created, so the named items next to ID 89274 (89269 to 89280) were usually added in the same batch as Helm of the Shadowy Conqueror: the same quest line, zone, vendor or reward set.