|This article is about the Hive World; for the other uses, see Agathon (disambiguation).|
|Map||Basic Data||Planetary Image|
|Class:||Hive World/Fortress World|
Agathon survived both the Dark Age of Technology and Age of Strife relatively unscathed. During the Great Crusade, the world was brought into the Imperium by the 60th Expeditionary Fleet and the MaSade Family of Rogue Traders. The powerful Hive World became a major hub in the northern Imperium thereafter, becoming the center of a semi-autonomous entity known as the Agathean Domain which consisted of several planets. Agathon also became well known for its Solar Auxilia Cohorts during this time.
During the Horus Heresy, internal debate among the elector parliament of Agathon erupted over whether to stay loyal to the Emperor or ally with Horus. Eventually a bloody coup led by Ireton MaSade wiped out the counts and firmly pledged the Agathean Domain to the Emperor. Agathean worlds and forces suffered heavy losses during the subsequent Battle of the Coronid Deeps.