Hannibal

The Fourth Doctor claimed to have met Hannibal, (PROSE: The English Way of Death) and mistook the Brigadier for him after his third regeneration (TV: Robot)

The Seventh Doctor claimed to have taken part in Hannibal's march over the Alps. (PROSE: Shadowmind)

Hannibal crossed the Alps by using vinegar to dissolve boulders. Harriet Jones was reminded of this when the Ninth Doctor told Mickey Smith to use vinegar against the Slitheen attempting to kill Jackie Tyler and him. (TV: World War Three)

Barbara Wright, to distract the Daleks, fabricated a story of a revolt which included Hannibal's forces crossing the Alps. (TV: The Dalek Invasion of Earth)

Marco Polo believed that gifting Kublai Khan the Doctor's TARDIS would make the Khan a stronger ruler than Hannibal. (TV: "The Roof of the World")

Behind the scenes

 * He was portrayed by Alexander Siddig in Hannibal- Rome's Worst Nightmare.