Ridian Artemanis
Ridian Artemanis, along with Cymar Xydias, was a Chapter Master of the White Consuls, having succeeded Titus Valens following his death in the Battle of Boros Gate.
When the Thirteenth Black Crusade began, the Chapter's traditions dictated that Artemanis take command of the bulk of the White Consuls' forces to aid in the defence of the Cadian Gate, while Xydias remained behind with a garrison force to defend their homeworld, Sabatine. Disaster struck when the Great Rift was created and The Blackness caused the garrison to lose contact with Artemanis' forces and the wider Imperium.[1a] This later allowed the Lords of Silence and the Weeping Veil Chaos Warbands to successfully invade Sabatine and they easily destroyed the White Consul garrison.[1b] The fate of Artemanis and his forces is unknown.[1a]