c.M30 – Trilla is first colonised by Imperial forces

Early M31 – The Horus Heresy grips the galaxy, on Trilla Governor Thrand leads a failed rebellion.

198.M34 – The First Shrine War between Dorvastor and Cirrus I

840.M35 – The Vulticus Epidemic

Early-mid M36 – The Age of Apostasy, the Anargo sector is riven by war.

567.M36 – The Gaian revolt occurs on Anargo Primus bringing an end to the Apostate wars.

575.M36 – The Adeptus Mechanicus and the Administratum sign the Trillan Accord, beginning the current system of government on Trilla.

340.M39 – The Sigma-strain crisis.