23rd century
The 23rd century, defined in the calendar of Earth as being from 2201 until 2300, was a period of expansion for the United Federation of Planets, with Humans and other founding species, such as Vulcans, at the forefront of exploration.  The Federation's exploration agency Starfleet would make first contact with numerous intelligent species and civilizations, including the Talosians, the First Federation, the Gorn Hegemony. the Metrons, the Horta, and the Excalbians. The long-running conflict with the Klingon Empire, begun in the 22nd century, was a major part of this century's history, as was the rekindling of tensions with the Romulan Star Empire. Of particular note are the voyages of the  and the careers of its long-serving command staff under James T. Kirk.

Decades

Major events

Relations between the Federation and the Klingon Empire degenerate starting a tense cold war. ()

The duotronic computer is invented by Doctor Richard Daystrom, becoming the primary computing platform for all Starfleet vessels for the following eighty years. (; )

The Federation starship  is launched under the command of Captain Robert April. (; )
The Federation starship  launches under the command of Captain Matthew Decker.( commemorative plaque  )
The Battle of Donatu V is fought between the Federation and Klingon Empire. ()

 between the Federation and the internally riven Klingon Empire breaks out. ()

The costly Federation-Klingon war comes to an end and the Klingon Empire is politically stabilized. ()

Control is defeated and the mystery of the Red Angel is discovered by the crews of the  and the USS Enterprise. After the conflict, the crew of Discovery jump 930 years into future. ()

The El-Aurian homeworld is destroyed by the Borg. () Klingons and Federation sign some kind of peace treaty. ()

After a century of isolation, the Romulan Star Empire engages in a series of unprovoked attacks on several outposts along the Romulan Neutral Zone. During the incident, the first visual contact of the previously unseen Romulans themselves are made, revealing them to be an offshoot of Vulcans. ()

Federation-Klingon relations improve with the signing of the Treaty of Organia. Together with the Romulan Star Empire the two powers also establish a "colony of galactic peace" on Nimbus III. (; )

The  disappears while on the Typhon Expanse. ()

The detonation of the Genesis Device during the Battle of the Mutara Nebula, results in the formation of the first artificially-created planet. Due to the use of protomatter in the development of the device, however, the planet proves to be unstable and destroys itself soon after. (, )

Earth is again saved from being obliterated by a probe of unknown origin. ()

Despite the prior assassination of Klingon Chancellor Gorkon, the Khitomer Accords between the Federation and the Klingon Empire are signed at the Khitomer Conference to establish a lasting peace between the two powers. ()

Alternate reality

The  is destroyed battling the Narada. ()

 The Narada uses red matter to destroy . The crew of the newly-launched  prevents a similar fate befalling Earth. ()

After a bombing in London, an attack on Starfleet Headquarters, and a massacre on Qo'noS, the terrorist  crashes the dreadnought  into San Francisco before being arrested by the Enterprise crew and returned to cryogenic sleep. ()

A fully recovered Kirk gives a stirring speech about the principles of the Federation, and embarks on his historic five-year mission aboard the Enterprise. ()

After only three years into its five year mission, the Enterprise is destroyed during a battle over the planet Altamid, when it is attacked by Krall and his Swarm ships. The long-lost  is discovered intact on Altamid by . ()

Events without specified years

Prime reality

Early 23rd century
As of sometime between 2226 and 2240, the  exists on Cardassia Prime and is known for its serialist poets such as Iloja of Prim, who is ultimately exiled on , however. ()
Somewhere between 2236 and 2254, the time barrier is broken. ()

Mid 23rd century
A Vulcan science mission discovers a subspace rupture in the Hanoli system. The Vulcans attempt to seal the rupture with a pulse wave torpedo, but instead cause the rupture to expand exponentially. The entire star system, including the Vulcans, is wiped out. ()
The last diplomatic contact between the  and the Prytt Alliance before 2370 takes place on Kesprytt III. ()

Late 23rd century
An attack on Earth by a massive machine lifeform called V'ger is closely averted in the 2270s. ()
The tribble species is eradicated by the Klingons. ()
 A group of young Ba'ku desires to follow the way of the offlanders. They attempt to take over the Ba'ku planet, but fail and get exiled, thereby becoming the Son'a. ()

Unspecified
Cloaking devices are installed aboard Klingon starships such as the . ()
On the homeworld of the Haliians, the family of Aquiel Uhnari acquire a house they will live in for the next five generations. ()
An alternate approach to the transporter, the Elway Theorem, is first tested in this century. Instead of utilizing subspace as the medium for which matter and energy are transported from one location to another, this form of transporting uses dimensions of space. In the end, this approach is rejected as fatal for the subject and being not as nearly as accurate as the transporter. ()
The Klingon Empire relinquishes its claim to the Archanis sector. ()
Bajoran musicians known as the Boldaric masters produce music. ()
The common use of invidium in medical containment fields is ended. ()
The first small and unstable wormhole is mapped near a T-Tauri system. ()
On Tagus III, the Taguans seal off the ruins to outsiders. ()
On Kaelon II, the theories of helium fusion enhancement are first proposed. ()
 An earthquake is registered on Penthara IV. For the next hundred years, the planet is seismically quiet. ()
The first diagnosis of Iresine Syndrome is made. ()
The Federation raises the alarm about rising toxicity thinning the atmosphere of Urna. ()
Sometime after Emperor Philippa Georgiou's departure from the mirror universe, the distance between the prime universe and the mirror universe began expanding. This expansion becomes so great that the last crossing between the two universes takes place in the 27th century, stranding any residents from the mirror universe who stayed in the prime universe, and vice versa. ()

Mirror universe
Late 23rd century to early 24th century: Sometime between 2267 and 2270, Spock becomes commander-in-chief of the Terran Empire and implements several major reforms, turning the Empire into a more peaceful and less aggressive power. Prior to the full enactment of these reforms, the Terran Empire forces occupy . Spock's reforms leave the Empire unprepared to fight against the Klingon-Cardassian Alliance. The Alliance conquers the entire Terran Empire, enslaving the Terrans and Vulcans. ()

Appendices

23rd century productions
Except for 

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 seasons 1 and 2

Except for  and

External links

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