Quintillus System

Galaxy Portal

The Quintillus System^[1] (also named sector Quintillus) is the name of a small solar system located just outside of the Segmentum Solar.^[2]

The armies of the Emperor and Horus, fought over the system for six years, during the Horus Heresy. Their battles were full-scale military actions^[2], but since the conflict began in the early days of the Heresy, confusion about the civil war still reigned. The Traitors took advantage of this and tampered with the Loyalists' reports, which led the Emperor's forces to fight each other. One such incident, caused a battle to break out between the Blood Angels and White Scars Legions.^[3]

Planets

Known planets and other major objects of the Quintillus System:

• Argus^[1]
• Alpha Primus^[1]
• Listening Post Audus^[1]
• Cartheginus^[1]
• Traigo^[1]

Sources

• 1: Warhammer World Event - The Shadow War (last accessed 2 December 2018)
• 2: Warhammer World (saved archive page, dated Aug 2016, last accessed 2 December 2018)
• 3: The Horus Heresy: Legions: Facebook page (Saved archive page, dated 7 September 2025, last accessed 27 September 2025, original link: https://www.facebook.com/photo.php?fbid=1353815346754053&set=pb.100063768002035.-2207520000&type=3)