Hasari
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The Hasari were a race of people (or possibly a political organization) that ruled over a "nation". This "nation" was seized by the Cylons, an event which prompted the Colonies to liberate the Hasari "nation" and marked the beginning of the Thousand-Yahren War (Saga of a Star World).
Notes
It is unclear what relationship the Colonies and Hasari shared, or even if the Hasari were still in existence during the timeframe of TOS.