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|Subsector = [[Sub-Sector Solar|Subsector Sol]]{{Fn|1}}
|System = [[Sol System]]{{Fn|1}}
|Population = Unknown
|Affiliation = [[Imperium]]{{Fn|1}}
|Class = [[Mining World]]{{Fn|1}}
|Tithe Grade = Unknown
}}
During the [[Dark Age of Technology]] Mercury's city of '''Cytheron''' used force field generators to hold back the rays of Sol itself. This technology was later utilized by the [[Dark Angels]] in the form of the [[Cytheron Pattern Aegis]].{{Fn|4}}
During the [[Horus Heresy]], shoal facilities operated in Mercury's orbit despite its conditions. [[Alpha Legion]] infiltrators also worked with anti-Imperial scavenger clans in the area during the [[Solar War]].{{Fn|2}} Shortly before the [[Siege of Terra]] the the [[Sisters of Silence]] purged [[Psyker]]s from Mercury in a bloody pogrom.{{Fn|3}}
Some time after the [[Great Rift]] appeared, preparations for an uprising by a [[Genestealer Cult]] were discovered on the planet's [[Decima-Caldus]] orbital platform. A combined Talon of [[Custodians]] and [[Silent Sisters]] struck fast and drove the punishing blade through the cult - right to the [[Genestealer Patriarch|Patriarch]], killing it outright.{{Fn|5}}
