|Affiliation:||Coalition of Planets|
United Federation of Planets
Hundreds of years ago, the Coridans colonized other planets in their system and became warp capable. They became trading partners with the Orions. In the early 22nd century, the Vulcans made first contact with the Coridans. (ENT: "Shadows of P'Jem", "Demons")
In 2151, there were three billion Coridans living on the planet. The majority lived in several cities in the equatorial region. The planet was known for its extensive shipyards and its advanced warp-capable vessels. However, the planet was also embroiled in a conflict between rebel forces, supported by the Andorians, and the government, backed by the Vulcans. The Tau Ceti Accords prohibited Andorian presence on the planet. The Vulcan agenda was to keep the planet's chancellorship stable, which in turn assured its dilithium exports to Vulcan. (ENT: "Shadows of P'Jem")
Chancellor Kalev invited Captain Jonathan Archer and T'Pol of the Enterprise to visit the planet, but they were captured by rebels and held for ransom. As a result, both Sopek, assisted by a Vulcan commando force, and the Andorian Imperial Guard, led by Shran (violating the Accords) came to assist the rescue. (ENT: "Shadows of P'Jem")
Over the next century, Coridan would become under-populated to the point that it could not defend its dilithium mines.
In 2267, Coridan sought admission to the United Federation of Planets. However, due to the wealth of minerals available on Coridan and the presence of illegal mining operations, Coridan's admission was a controversial subject between Tellarites and Vulcans. The Babel Conference was convened to settle the matter and ultimately approved Coridan's admission. Ambassador Sarek of Vulcan was credited with achieving the consensus towards admitting the planet to the Federation. (TOS: "Journey to Babel"; TNG: "Sarek")
During the Dominion War, Coridan's dilithium mines came under attack by the Dominion in 2374 due to their strategic importance. Gelnon left Kudak'Etan in command of the USS Defiant while he and his ship left to launch an attack on Coridan. (DS9: "One Little Ship")
Presumably, Coridan was located in the Alpha Quadrant.
Coridan was the third planet of the Coridan system. This M-class world was governed by The People's Republic of Coridan from its seat at New Coridan. The dominant species were the humanoid Coridans. The Coridans were warp capable in 2093. In the mid-22nd century, there were three billion living on Coridan. This planet was a destination on the Vulcan trade routes. On 10/01/2151, the Enterprise visited this planet. By the mid-23rd century, a centuries-long civil war had reduced the population. In 2378, Coridan was a Federation member. (Pgs. 45, 53, 60, "United Federation of Planets I")
In the non-canon novel The Good That Men Do, Coridan was referred to as "Coridan Prime", on the verge of developing warp-7 technology. To prevent such advances from spreading to other Coalition of Planets member worlds, the Romulans launched a vicious attack on Coridan, flying a vessel into the planet at maximum warp. Anti-matter from the suicide attackers' ship mixed with Coridan's abundance of dilithium, causing a fireball that spreads across the planet, killing billions. The planet's population was said to be further depleted by civil wars that continued after the Romulan attack.