1505

The Doctor writes "THIS IS A FAKE" on the boards Leonardo da Vinci would use to paint six copies of the Mona Lisa. (TV: City of Death)

In 1505, the Fourth Doctor arrived at Leonardo da Vinci's studio from the year 1979, seeking clues to Count Scarlioni's plot to steal the Mona Lisa in that year. Leonardo, the Doctor discovered, was painting copies of his most famous work for his new patron, Captain Tancredi. He learned that Scarlioni and Tancredi were actually temporal splinters of the same person — Scaroth, last of the Jagaroth. After being briefly captured and interrogated by Tancredi, the Doctor escaped back to 1979, after writing, "This is a fake", on Leonardo's canvases in felt tip pen. (TV: City of Death)