Vestians are natives of the Vestios system. The Vestians settled several planets within their system, including Vestios Prime and Vestios II, all ruled by a Vestian Council. There had been numerous conflicts between the Vestians and the Federation in the early years of the 23rd century. A treaty between the two in the 2240s ensured peace between the two for several years. The Vestians became members of the Federation in 2310. Ambassador Spock attended a conference on Vestios Prime in 2320 to mark the tenth anniversary of their membership. (TOS novel: Burning Dreams)