Colchis: The former homeworld of the Word Bearers Space Marine Legion, before they fell to the lure of Chaos. Colchis was once and advanced human colony, which fell to religious fanaticism during the Dark Age of Technology. When Lorgar was found, the planet was ruled by the Covenant, the most powerful of factions on Colchis.
After the Word Bearers turned to Chaos, Colchis was destroyed by the Ultramarines; blasted to pieces by cyclonic torpedoes.
Real-world Reference: Colchis was the island in Greek legend where Jason and the Argonauts sailed to find the Golden Fleece.
Source: Codex: Chaos, 2nd Edition by various, Codex: Chaos Space Marines, 3rd Edition by various
Submitter: Simguinus
Hive World Terra