Forum:When did Betazed join the Federation?

Is there any information on when Betazed became a Federation member? I know it was prior to the 2300's but that's all. Thanks for the info or help finding it. Chaos99.194.92.234 20:32, October 2, 2010 (UTC)
 * See the Betazed talk page. There might be more info at Memory Beta. - 21:01, October 2, 2010 (UTC)