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An unusual world, Memlock was nine times the size of Terra and sported three moons. Ancient ruins on the surface hint at an artificial Xenos origin for its optimal orbit, which creates calm and stable seasons. During the Great Crusade it allied with Heraldor in resisting Imperial rule but was brought into its fold by the Legiones Astartes. Memlock was later the site of a battle where the Alpha Legion and the Klarkash Imperialis Auxilia fought against the Khrave Xenos during the Great Crusade. It is known to have raised cohorts for the Solar Auxilia.
When the Horus Heresy erupted Memlock at first seemed loyal but turned when emissaries of Horus turned ambitious lesser clan-lords against their brethren. In a brief but vicious civil war the traitor element emerged and joined Horus and was the site of bitter fighting during the Thramas Crusade. Later when the Heresy turned against the Warmaster the lords of Memlock abandoned the planet, though the agents of the Warmaster would warp the planet into something terrible to behold.
- 1: The Horus Heresy Book Three - Extermination, pg. 83
- 2: The Horus Heresy Book Six - Retribution, pgs. 130–131, 135
- 3: The Horus Heresy Book Nine pg.78