Starbase 4 was a Federation starbase operating from at least the 2260s.
The survivors of a Federation expedition to Triacus were transported to Starbase 4 by the USS Enterprise in 2268. (TOS: "And the Children Shall Lead")
Later in the same year, a shuttlecraft was stolen from the starbase by Lokai, a fugitive from the planet Cheron, two weeks before it was found by the Enterprise. (TOS: "Let That Be Your Last Battlefield")
Apocrypha
- Starbase 4 also appears in the Pocket Book novel Memory Prime, written by Garfield Reeves-Stevens and Judith Reeves-Stevens. The base is under the command of Commodore Montana Wolfe, and has its insignia in the rough shape of the Orion constellation.