Arachosia Prime, also known as Arachosia in the Caladarian Galaxy and formerly as Marcia Prime (during the twelfth and thirteenth centuries), is the adoptive home world of the Arachosian species, the first of three alien species in the first millennium AH to conquer the Laurasians. The Arachosians themselves originated from the Felix Galaxy. Their evolution and progression had been in coordination with that of the Millians, until they obtained a Space Age c. 1000 BH. The Arachosians then jumped ahead, inventing a jump drive within two centuries and conquering the majority of their galaxy between 800 and 600 BH. They became despised, however, for their ruthlessness and dictatorial rule, and eventually, in 585 BH, the subjugated species of the Felix Galaxy rose against them. The Arachosians,