Kadiatu S. Lethbridge-Stewart (PROSE: Christmas on a Rational Planet) or Kat (PROSE: The Keeper of Fang Rock) was the daughter of Mariama and the granddaughter of Alistair Gordon Lethbridge-Stewart and Mariatu. She became a historian, and wrote The Zen Military, which was published in 2006. (PROSE: Remembrance of the Daleks, Christmas on a Rational Planet)

Circa 2018, Kadiatu attended several protest marches about Brexit with her cousins Conall Lethbridge-Stewart, Gordon Lethbridge-Stewart and Nick Wilson. (PROSE: Lucy Wilson & The Bledoe Cadets)

In 2018, Kadiatu called Albert and Tamara Wilson to congratulate Lucy Wilson on becoming host of the Billy Bandril Show. (PROSE: The Bandril Invasion)

Kat and Lucy Wilson went on holiday to Fang Rock and met a Rutan. (PROSE: The Keeper of Fang Rock)

Her descendant, Kadiatu Lethbridge-Stewart, was named after her. (PROSE: Transit)

T. E. Hamster mentioned "the author of The Zen Military" in his opinion piece "Take Me Down To Paradise Towers": Reclaiming Kroagnon: Democratic accountability and the Defence of the Past, published in the Journal of Presentism and Transtemporal Mendacity, but was unable to mention the author by name "pending litigation". According to Hamster, this author was a figurehead of the Ice Hot movement alongside Megali Scoblow. (PROSE: Reclaiming Kroagnon)