Cartheo Prime, also known as Carthili'ok by the Edanian Empire, is the homeworld of the Cartheons and a province of the Semerian Commonwealth. It is an Earth-like planet consisting of three cities: Cartheloun, capital of the planet, Melakroen, and Shaaltorehn. Originally ruled by the Edanian Empire, it was later abandoned and then, by 1500 AD, conquered by the Corgian Empire. However, during the Semerian-Corgian War, the Commonwealth launched a full-scale blitzkrieg upon the planet and ensured the liberation of its native inhabitance, who now hold the title of "honorary Semerians]].

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