The Sons of Vengeance are a Renegade Chapter of Chaos Space Marines who turned to the service of the Ruinous Powers during the Obscuran Uprisings which ravaged the Segmentum Obscurus during the 34th Millennium.
Not much is known of this former Loyalist Chapter's deeds before they turned Renegade. During the Obscuran Uprisings in the late 34th Millennium, the Sons of Vengeance were sent by the Imperium of Man to quell anarchist separatist rebellions which had plagued much of the Segmentum Obscurus for nearly four Terran centuries. The Sons of Vengeance, along with a fellow Loyalist Space Marine Chapter, the Silver Guards, initially fought on the side of the Imperium but became Renegades after their actions led to the fall of the rebel Free Council of Hannedra II. Brutally crushing the rebellion that had overthrown that world's Imperial Planetary Governor, the two Chapters ran wild, slaughtering and looting in the name of the Emperor of Mankind.
Soon the Renegades dropped even the pretense of punitive action against the rebels when the Sons of Vengeance took the campaign to the neighboring system of Laskaria, which at the time was still loyal to the Emperor. By the time news of their treachery reached the Adeptus Terra, the two Chapters had split into dozens of fractious warbands of Chaos Space Marines and turned 14 star systems into their battleground as they spilt each other's blood in a savage war for dominance.
The Sons of Vengeance Chapter badge is a white morning star on a red and blue camouflage background.
- Codex: Chaos Space Marines (4th Edition), pp. 17-18, 24