The 5th century was defined by the calendar of Earth as occurring from the year 401 through the year 500.
- The Visigoths sack the city of Rome, during the reign of Emperor Honorius. The Western Roman Empire falls before the end of the century. (TNG: "The Best of Both Worlds")
- Apocryphal events concerning Vulcan and Romulan's history :
- 404 - Death of the vulcan philosopher Jarok. (LUG: "All Our Yesterdays" p. 26 ; LUG: "The Way of Kolinahr" p. 16 & 19)
- 453 - Massive vulcanoid colonization of Rigel V. (LUG: "All Our Yesterdays" p. 26)
- 474 - During romulan exodus, the Admiral Debrune lead a dissident movement, who chose to colonize Yadalla Prime and other worlds. (LUG: "The Way of D'era" vol. I p. 14 & 16-17 ; LUG: "All Our Yesterdays" p. 26)
- 481 - Death of the vulcan philosopher Surak. (LUG: "All Our Yesterdays" p. 26 ; LUG: "The Way of Kolinahr" p. 19)
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