Secret History Season 15, Episode 4: The Other Prince William

London's Lost Graveyard - The Crossrail Discovery

Engineers from the Crossrail construction project have uncovered a 300-year-old graveyard that reveals intriguing new information about the people who built London.

Prince Philip - The Plot to Make a King

Documentary telling the inside story of the plans by Louis Mountbatten to manoeuvre his nephew and heir to the Greek throne, Philip, into marrying the future queen Princess Elizabeth and the tensions that that unleashed.

Hunt for the Arctic Ghost Ship

Secret History has exclusive access behind the scenes of the momentous expedition that found HMS Erebus: the Royal Navy ship that disappeared in 1845 while searching for the Northwest Passage

First Humans: The Cave Discovery

Documentary following the discovery of fossilised remains in a deep and nearly inaccessible cave in South Africa. The bone fragments recovered were found to have come from a previously unknown species of human ancestor.

Cleopatra's Lost Tomb

An insight into the pioneering work of criminal lawyer-turned-archaeologist Dr Kathleen Martinez, who has made it her life's mission to locate the final resting place of Cleopatra, Egypt's last queen.

China - Treasures of the Jade Empire

A look at the relics found in the tombs of China's Han Dynasty - an era that is generally considered the golden age of ancient China. It's up there with the Roman Empire in terms of international power at the time and has been a defining influence on the country's cultural identity ever since, with China's majority ethnic group referring to itself as the "Han people" and the Chinese scripts referred to as "Han characters". This programme examines how the emperors arranged to have their dead bodies mummified in the search for immortality and looks at a newly discovered version of the famous terracotta army - sculptures depicting the armies of Qin Shi Huang, the first Emperor of China.

Sex Change Spitfire Ace