From The Stargate Omnipedia

Neighboring country to Kelowna and the Andari Federation on the planet Langara, Terrania formed an alliance with the Andari after generations of warfare. Kelowna believed it was a prelude to a joint attack on their own nation, and used a naquadria bomb against them. The three nations met together for peace talks, and after the threat of invasion and occupation by the Goa'uld Anubis, formed a tenuous peace administered by the Joint Ruling Council.

Terrania's representative to Kelowna is Ambassador Sevaarin. Its representative on the council is Vin Eremal.


Meridian - SG-1 visits Kelowna, and learns that they are developing a naquadria bomb to potentially use against Terrania and the Andari.
[https://www.gateworld.net/sg1/s6/shadow-play/ Shadow Play - Its weapon completed, Kelowna threatens to use it against Terrania and the Andari, who have united against them.
Homecoming - Terrania joins the negotiating table for peace talks after the Kelownans drop a devestating naquadria bomb, but Anubis soon occupies their world. The Terranians steal naquadria from their allies, the Andari, in the hopes of appeasing the Goa'uld.
Fallout - Terrania sends Vin Eremal, its representative on the Joint Ruling Council, to Earth to negotiate the relocation of their people -- but learn that a team led by Jonas Quinn has averted the planet's doom.