Beathan Lem was the seventh host of the Lem Trill symbiont. He was born in 2350 and died in 2381, and he was 24 when they were joined. The host and symbiont were joined for seven years. (Starship Independence) Beathan was a Starfleet tactical officer by training, and also a graduate of Starfleet's Advanced Tactical Training program. His thesis paper on "The State of the Federation" gave him many sleepless nights. ("For I Have Sworn Eternal Hostility")