Cyzicus System
From Warhammer 40k - Lexicanum
The Cyzicus System is a star system located a short warp jump from the Hamartia System.[1]
The system was uninhabited by the time of the Horus Heresy, the star being a red giant that has swallowed the inner planets and left only the outer gas giants and the planetoids of its Kuiper Belt.[1]