Christopher Columbus

Christopher Columbus (1451-1506) was a Genoese navigator and explorer who, amongst other things, discovered America.

The Doctor had met Columbus at some point and acquired his business card. (DW: The Two Doctors) The Doctor traveled with Columbus on the Santa Maria, and suggested that Columbus plot his course with an orange and a biro, but Columbus didn't listen. (PDA: Eye of Heaven)

Ian Chesterton called Vicki "Christopher Columbus" when she ran off on her own to explore the Sagarro Desert on the planet Aridius. (DW: The Chase)

When discussing how certain the Doctor was about Zeos being hidden he declared "How could Columbus be so sure", to which Romana replied "Who?". (DW: The Armageddon Factor)

Ace unfavorably compared Raphael to Christopher Columbus when he failed to realise her intention to explore Kirith's Harbours. (NA: Timewyrm: Apocalypse)