Artolun
From Warhammer 40k - Lexicanum
Artolun was an Imperial Fists Huscarl, who took part in the Horus Heresy's Siege of Terra.[1b]
History
He was among Sigismund's Seconds, the Imperial forces that the Emperor's Champion Sigismund led after the Imperial Palace's Sanctum Imperialis sealed its doors. They later destroyed the Sons of Horus' 10th Company, as the Traitors were about to attack the mostly civilian Imperials that were led by Euphrati Keeler. Afterwards, Sigismund agreed to escort Keeler's Imperials to safety[1a], and Artolun would command the Champion's Outriders, who advanced ahead of their combined group.[1b]