Periclitor
Periclitor the Foresworn was a Chaos Lord of the Word Bearers Legion2 who began his long quest to Daemonhood in 832.M33 with the Castile V massacre. Among his later triumphs were the martyrdom of Saint Jerome (called Jerome the Pure by the Imperium, and Jerome the Fool or Jerome the Blind by Periclitor's forces), the last stand of the Terran 5th Armored Praefects, battle against the Grey Knights in the Sentry Vault, the ambush and slaughter of the Howling Griffons' Chapter Master and First Company on the eve of the 5000th anniversary of their founding, and the murder of the Cardinal of Bray. The last incident touched off a series of attacks by Periclitor's forces that eventually caused the entire Trans-Kurani subsector to erupt in civil war over the issue of taxation for defence of the subsector.1
Once the Braun IV Tithe Wars - as this conflict was known - was touched off, Periclitor was elevated to Daemonhood in 187.M39.1