Regicide is the act of killing a king— something that the British monarchy had endured for centuries, with some of the rulers not even being given a chance to reign. Some were just blatantly killed, with the murderer sometimes succeeding the throne. That was the case when Malcolm III assassinated and usurped Lulach. There were also some monarchs whose deaths were a bit of a mystery, perhaps laced with unfortunate events, perfect timing, or something else. With that, here are three monarchs whose deaths were a mystery.

Edward V of England

Edward V was 12 years old when he succeeded his father, Edward IV, after his death in April 1483. However, he was never officially crowned King of England as his reign was cut short that June of that same year. His uncle, the Duke of Gloucester Richard III, largely controlled his brief reign. Soon, he and his younger brother were moved by their uncle to the Tower of London, and the parliament declared Richard III the new and legitimate king. On the other hand, the princes were confined to the inner apartments of the Tower. By summer, the boys were seen less and less. Until one day, they never reappeared from the public, as if they had just vanished from the earth.

In 1647, the workers tasked to rebuild the Tower found bones in a staircase suspected to be of the princes. However, in the 1930s, the bones were reinspected and were found to be incomplete skeletons mixed with animal bones. This led to a serious debate and confusion on whether the bones were really of the two royalties.

In 1789, workers who were repairing the St. George’s Chapel in Windsor Castle accidentally tapped into the vault of Edward IV and Elizabeth Woodville. It was adjoined to another bolt with tombs inscribed with the names of two of his children who died before him: George and Mary. What was baffling was that the remains of these two children were later found somewhere else in the chapel, which posed the question: Whose remains were in their tombs? Did their uncle murder the two princes to secure the throne? Did he perhaps rearrange all these bones so no one could figure out what he did? Could these two be relocated outside the royal court and live an ordinary life? No one knows.