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The first days of the Iron Snakes are difficult to pin down; reportedly a [[Second Founding]] chapter, their [[Legion]] of origin is unknown. Although they pay respect to [[Roboute Guilliman]], it is uncertain if they are an [[Ultramarine]] descendant, particularly as they are a non-[[Codex]] chapter. The current [[Chapter Master]], Seydon, is the eighteenth to bear that title since the foundation of the Iron Snakes.

===The Reef Stars===

The Iron Snakes appear to have been stationed in the sector of space known as the Reef Stars many thousands of years ago, and charged with its protection as their primary mission. The inhabited worlds of the Reef, while varied in their technological development, each appear to have some form of summoning aid from the Iron Snakes ritualised into their society. The Iron Snakes are a myth or legend to some worlds, an awe-inspiring reality to others. Regardless of how they are viewed, the Snakes of Ithaka take their duty to the Reef Stars as seriously as only Space Marines can, and will go any lengths possible to protect the sector and its citizenry.