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Mars was once part of the Forerunner Empire 100,000 years ago, when it was known as Edom. The planet was mostly inhabited with Miner-class Forerunners. Born Steller Makes Eternal Lasting was sent there by his Builder family to "learn discipline".
- Main article: Interplanetary War
The planet was named after the Roman God of War, Mars. Mars was one of the first worlds colonized by humanity settled in 2080. It has since been terraformed into a planet with near-Earth conditions, becoming home to many. Regardless, Mars was the site of a decisive battle during a period where the United Nations organization transitioned into the United Nations Space Command. The UNSC Marines routed the neo-Communist Koslovics on the planet during a series of brutal conflicts in the 2100s before moving on to destroy the Koslovic and Frieden movements throughout the solar system.
- Main article: Human-Covenant war
Once again, Mars was the site of a large scale engagement called the Battle of Mare Erythraeum, set on the fields of Mare Erythraeum. There, Colonel James Ackerson and his UNSC Defense Forces combated against the Covenant Loyalist Army, commanded by Jiralhanae Chieftain Lepidus, a battle the UNSC also lost.
- Mars is the birthplace of Nicole-458, Dutch, Benjamin M. Nunez, and Thomas Lasky.
- The colonization of Mars was a major plot point in Bungie's Marathon.
- Although Mars has been terraformed, it is a mystery as to why the planet still looks red and barren.