Genghis Khan

Genghis Khan was a Mongol military leader. In 1289, the First Doctor, Ian Chesterton, Barbara Wright and Susan Foreman met Genghis Khan's grandson, Kublai Khan. (DW: Marco Polo)

The Seventh Doctor claimed to have delivered Genghis Khan, saying that he was "a sweet baby." (NA: Tragedy Day) The First Doctor had previously encountered him as an adult. (TN: Time and Relative)

When the Master claimed he wanted to rule people "for their own good", the Third Doctor wondered if he had heard Genghis Khan say the same thing. (DW: The Dæmons)

The Master lied to Chang Lee that the Doctor had been Genghis Khan. (DW: Doctor Who (1996))

The TARDIS once withstood an attack from the hordes of Genghis Khan, according to the Sixth and Ninth Doctors. (BFA: City of Spires, DW: Rose)