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Starbase 1 was a Federation starbase administered by Starfleet. It was located one hundred au from Earth, near a planetary body. In the 2250s the starbase was home to over 80,000 Federation personnel.
During the Federation-Klingon War, the starbase was attacked and occupied by the House of D'Ghor. The battle resulted in the deaths of many members of Starfleet Command and at least three Starfleet starships were destroyed. Upon the brief arrival of USS Discovery, 274 Klingon life signs were detected on the station, as was a painted on crest of House D'Ghor. (DIS: "The War Without, The War Within")