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)

Biography
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)

Behind the scenes

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