Leir I is a small, naturally habitable planet in the Leir system. Rich in minerals, it was initially settled by independent miners, mostly Humans, who established settlements without government support from the United Empire of Earth (UEE). It was not officially developed by the UEE when it was discovered in 2677 thanks to Imperator Illyana Messer VI's disinterest in the planet's resources. When a dangerous cult took over neighboring planet Mya (Leir II) in 2812, the UEE government chose to allow the Leir system and all its planets to remain unclaimed. Leir I remains autonomous, and is home to a scattered collection of small towns and mining outposts.