49th century

The 49th century was home to the Time Agency. (PROSE: Eater of Wasps, Trading Futures, The Man Who Dreamed of Stars) It was an era of peace and prosperity on Earth, (PROSE: Trading Futures) although one account indicated that World War V happened at some point during this century. (AUDIO: Singularity) The Tenth Doctor thought of this century as a period of human history when "everyone was off exploring the unknown". (AUDIO: Death's Deal)

The Free Colony Movement was active during this century. (PROSE: The Man Who Dreamed of Stars)

A member of Faction Paradox once suggested that the Doctor was originally a human from the 49th century who began travelling in time and space in order to flee from an Enemy who had overrun his home, but that the Doctor's biodata was then overwritten with a multitude of different origins which supplanted this version of history. (PROSE: Unnatural History) After he was stripped of his memories of the Time Lords and Gallifrey, the Eighth Doctor theorised that he may have been an exile from the 49th century. (PROSE: Escape Velocity)

During the War in Heaven, the enemy once launched an assault on the 49th century which Robert Scarratt helped to counter. (PROSE: The Brakespeare Voyage)

Earth's moon was terraformed to have an atmosphere. (PROSE: Trading Futures) One area of the Moon wasn't explored by humans until this century; the Tenth Doctor and Rose Tyler once considered leaving a Women's Institute flag there to confuse 49th century historians. (PROSE: I Am a Dalek)

Humans terraformed Alfava Metraxis and began to settle the planet. Over the next two centuries its population grew to six billion. (TV: The Time of Angels)

The Hokrala Corp was active. (PROSE: The Undertaker's Gift)

Refugees who came from a dying world in this century projected their consciousnesses through time and made contact with a spiritualist named Mrs Vanguard in the 1890s, passing themselves off as ghosts. They planned to transfer their consciousnesses into the bodies of influential people in 1890s London with their ultimate goal to take control of Queen Victoria. From the historical records, they were aware that she was still in mourning for her long dead husband Prince Albert. The refugee possessing the body of Henry Gordon Jago mentioned that, in decades to come, there would be "brutal, terrible wars that will decide the fate of this world." With one of their kind possessing Queen Victoria's body, they intended to "turn the tides of history" and create a new future, thereby preventing the destruction of their world. Their plan was defeated by Jago, Professor George Litefoot, Ellie Higson and Toby. (AUDIO: The Spirit Trap)

El Diablo was colonised by humans near the end of the century. (PROSE: Big Bang Generation)

For two days in this century, the Great Crystal Choir Crown of Pseudolonica VII was left unguarded. In this time, the Fourth Doctor stole it to give as a Christmas gift to Romana II. (PROSE: Present Tense)

Behind the scenes
In the original Doctor Who pilot episode, Susan Foreman claims that she is from the 49th century. This line was not carried over into An Unearthly Child when it was decided that the Doctor and Susan's race would not be attributed to a specified time.