Charles III

Charles III, formerly known as Prince Charles, was the king of the United Kingdom who succeeded Elizabeth II. Charles reigned with his Queen, Camilla, and was succeeded by William V. (PROSE: Revenge of the Judoon)

Marriage to Diana
In 1981, (TV: The Lodger) he married Princess Diana. (PROSE: Prisoners of the Sun) Melanie Bush believed them to be a strong couple. (AUDIO: Spaceport Fear)

He was photographed during his wedding to Diana. Said picture was altered by the Monks during the 2017 Monk invasion. (TV: The Lie of the Land)

During the Martian Invasion on 6 May 1997, the Prince of Wales and his sons were on the royal jet on course to London when the Martian ship entered the atmosphere, diverting to Madrid. (PROSE: The Dying Days)

In the late 1990s, Princess Diana died in a car crash. (PROSE: This Town Will Never Let Us Go) This was a tragedy which affected so many people, (PROSE: Father Time) including Elton John (PROSE: That Time I Nearly Destroyed the World Whilst Looking for a Dress) and Sixth Doctor companion Evelyn Smythe, who dearly wished to go back to save her. (PROSE: Instruments of Darkness)

With Camilla
Charles and Camilla were popular items of gossip in 2005. (AUDIO: One Rule)

By 2010, he had married Camilla. In that year, Clyde Langer and Rani Chandra faced two Automatons who were looking for the estranged crown prince of their homeworld. Clyde jokingly offered them to take Prince Charles and Camilla as a replacement. (TV: The Empty Planet)

When the Tenth Doctor found that Edward VII had disappeared along with Balmoral Castle in 1902, he warned that the future of the royal family, along with the rest of history, was threatened. Saying that, along with the rest of his successors, there would be no Charles III. (PROSE: Revenge of the Judoon)

As King
As Rani Chandra explained, in the same way Gavin was the son and the heir to his father, Prince Charles was the son and the heir to the Queen. (TV: The Empty Planet)

Elizabeth II assumed in 1977 that Charles would be King by 2022, before learning, to her amazement, that she would be celebrating her seventieth year on the throne in that year. (PROSE: The Platinum Sceptre) However, according to another account, the British Army had a group called the King's New Delta Squadron by 2020. (AUDIO: Black and White)

Upon seeing the Council House of Kirith, the Seventh Doctor wondered what King Charles would have to say about its blend of architectural styles. (PROSE: Timewyrm: Apocalypse)

Legacy
Charles III was immediately succeeded by King William V. (PROSE: Revenge of the Judoon)

Charles Windsor Griffiths was named after him. (PROSE: Attack of the Cybermen)

Other references
Jones suggested that a UNIT soldier would kick "the Prince of Wales, old Carlo", up his "royal britches" were he so ordered by his officer. (TV: The Green Death)

Alternate timeline
In an alternate timeline briefly created by Jamie McCrimmon in which the Glorious Revolution of 1688 was a failure, the name Charles III was taken earlier by the grandson of James II, Bonnie Prince Charlie, who was the reigning monarch of England and Scotland in 1788. (AUDIO: The Glorious Revolution)

Behind the scenes

 * In the real world, King Charles is the great great grandson of King Edward VII, firstborn son of Queen Elizabeth II and Prince Philip, the elder brother of Princess Anne, and the father of William, Prince of Wales and Prince Harry. He inherited the throne from his mother following her death on 8 September 2022, and was himself the former Prince of Wales from 1958 to 2022. Revenge of the Judoon, which mentions the lineal succession of Edward VII to Charles in DWU continuity, was published in 2008, 14 years before the then-Prince of Wales and Duke of Cornwall became King; Charles inherited the throne three years after the death of the book's author Terrance Dicks.
 * Charles married Camilla in 2005, which Yvonne Hartman alludes to in One Rule.
 * A recurring way of indicating it's the near future is to have a King (Charles) instead of Queen Elizabeth: this was the idea behind Battlefield and "the King" is briefly mentioned in AUDIO: The Longest Night. However, in the real world Charles became the King 33 years after the initial broadcast of Battlefield, a story which first aired a little over halfway through Elizabeth's 70-year reign.
 * Charles has been portrayed by Christopher Bowen in the telefilm Princess in Love, Paul Rhys in the docudrama The Queen, Tim Piggott-Smith in the play King Charles III and its television adaptation, Jon Culshaw in various comedy sketches, Josh O'Connor in the Netflix series The Crown, and was voiced by Dan Stevens in the animated series.
 * In 2013, Charles and Camilla paid a visit to the TARDIS set at BBC Wales' Roath Lock studios where they met Matt Smith and Jenna Coleman as well as posing with Daleks and Cybermen.