In early history, a band of marauders based on Triacus wreaked chaos on the inhabitants of the Epsilon Indi system. After many centuries of intrusion, the inhabitants of Epsilon Indi were finally able to rise up and destroy the marauders, leading to their corporeal extinction. (TOS: "And the Children Shall Lead")
Background information Edit
According to Star Trek: Star Charts (pp. 45, 66, "United Federation of Planets I") and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Draylax (Epsilon Indi) system was located in the Beta Quadrant. The primary was a K-class star. In the 22nd century, this system was a destination on the Earth trade routes. In the late 24th century, it was a Federation system.
According to the Star Fleet Technical Manual, the Star Empire of Epsilon Indii was one of the founding members of the Federation. The eighth planet of the Epsilon Indi was stated to be Andor, the homeworld of the Andorian race in The Worlds of the Federation.