Starbase 4

Starbase 4 was one of the first Federation starbases constucted at the turn of the 23rd century, and was located near to both Klingon and Romulan space.

In 2268, Starbase 4 took aboard two individuals from the planet Cheron, Bele and Lokai. Bele had been hunting Lokai down for many centuries, but Lokai managed to steal a shuttlecraft and escape Bele one more time. Both individuals and the shuttlecraft were later recovered by the USS Enterprise. (TOS episode: "Let That Be Your Last Battlefield").

In 2269, the Enterprise was docked at Starbase 4 for a month undergoing serious repairs and refitting. (TOS novel: The Abode of Life).

In 2270, the Enterprise was docked at Starbase 4 twice, undergoing repairs following various incidents. The first time was after the Enterprise was engaged in battle with factions eager to steal an experimental transwarp drive, and the second was following a battle with a Romulan warship. (TOS novel: Fortunes of War, #2: Battlestations!, and comic: The Chosen).

Starbase 4 was still operational in the 24th century. In 2368, the USS Enterprise (NCC-1701-D) ferried three Ullian ambassadors to the starbase, after one of their number had committed mind-rape against several members of the Enterprise crew. (TNG episode: "Violations").