Vobilin was a planet, the homeworld of the Vobilites, and a member of the United Federation of Planets. (ST novel: Starfleet: Year One)

Vobilin was an early member of the Federation and its influence was felt on other worlds, such as Earth. Some of the first signs of San Francisco's increasing alien population were clothing shops stocking fashion lines in the native style of the Vobilite. (ST - New Worlds, New Civilizations short story: "At Times of Peril")

Starfleet: Year One indicates Vobilite was in fact one of the founding members of the Federation. This has since been contradicted by numerous other sources, including canon in the ENT episode: "Zero Hour", which indicate Earth, Vulcan, Andor and Tellar (and sometimes Alpha Centauri) were the founding members.
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