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Sigma-Agrius is one of the worlds that provides food to the Agrippina Sector. The world is also a Ratling homeworld. When the Ratlings declared independence from the Imperium, a single Imperial Guard Regiment was sent to pacify the world. The regiment was the Finreht 122nd Highlanders, who eventually destroyed the rebellion along with the rebels in the Pacification of Sigma-Agrius. The Highlanders were granted the planet and eventually settled there, their descendants forming the ruling class of the world.