House Sidus is a secret loyalist Knight House of Ryza: Ryza refused to found a household even with Martian backing, keeping Sidus secret for its own purposes. When the house revealed itself in the Heresy, the Knights of Sidus fought beside Legio Crucius in the theatre of the Defence of Ryza.
- Category
- Knight House
- Side
- Loyalists
- Key events
- 1 event
- Forces
- Tertius rank (Questor Mechanicus); steadfast defenders of the forge of Ryza. Nicknames — the “Scions of Ryza” and the “Shackled Knights”.
Fate
A loyal house; its existence was known to only a few until the invasion of Ryza in the Heresy.
Key events
Sources
- WH40k Fandom: House Sidus
- Atlas compilation · source check 2026
Open in the atlas
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