Cestus III

Cestus III was a planet near the border between the United Federation of Planets and the Gorn Empire. In 2267, the Federation established an outpost there, unaware of Gorn claims in that region of space. (TOS episode: "Arena") The outpost was destroyed by the Gorn, and all personnel lost, despite the efforts of an accidental time traveler from the 24th century. (TNG novel: Requiem)

Following intervention by the Metrons, the Gorn ceded Cestus III to the Federation. The planet became a thriving colony world over the course of the next century, with several cities springing up across the planet, including Pike City (the capital), Johnson City, Lakeside, New Chicago, Palombo, Port Shangri-La, and Prairieville. The planet experienced a significant population explosion in 2370 when, following the formal end of the Cardassian Wars, Cestus III accepted a quarter-million people displaced by the establishment of the Demilitarized Zone. (TNG novel: A Time for War, a Time for Peace)

In 2371, the Gorn Empire faced a coup d'etat, and the rebellious warrior caste launched a surprise invasion of Cestus III. Fortunately, the rebellion was short-lived, and Gorn forces withdrew back to their own territory. (TNG comic book: The Gorn Crisis)

The old Earth sport baseball saw a renaissance on Cestus III in 2371, with the establishment of the Cestus Baseball League. (DS9 episode: "Family Business")