Ian Ball and Michael Fagan both made royal security breaches at a time when the Royal Family was believed to be untouchable.

In 2001, Princess Diana's trusted servant, Paul Burrell, was arrested for stealing items from her estate and became the terrified defendant in a gripping trial.

In 1918 the Soviets executed the Russian royal family, but questions remain about the deaths. Can DNA experts prove that the Romanov bloodline survived?

In 2001, officials blamed the Royal Palace massacre and the murder of the King of Nepal on the Crown Prince, but had he shot everyone before himself? Or was he framed?

Princess Grace of Monaco, otherwise known as Hollywood star Grace Kelly, died in a car crash in 1982, but many rumours circulate about the true events of that fateful day.

The newspapers blamed King Juan Carlos of Spain for his younger brother's death in their home in 1956, but had the King really held the gun that killed him?