Sarah O'Connell

The biggest source comes from Thomas More, a court figure who famously served as Henry VIII's Lord Chancellor a few decades later.

Or at least until Henry had his pious old head chopped off in 1535, when he refused to accept him as the new Supreme Head of the Church of England.

While Moore was just a child himself when The Princes in the Tower vanished, his book on Richard III seemed to imply insider knowledge to what went down.

Writing in the 1510s, Moore described how a Yorkist knight named Sir James Tyrrell was executed in 1502 for another crime, but confessed before his death to the role he'd played in the younger prince's death.

As one of Richard III's most loyal knights, Tyrell claimed that Richard himself had ordered him to personally make sure his nephews did not live to see adulthood.

Tyrell hired assassins Miles Forrest and John Dighton to do his dirty work, and these men crept into the boys' bedchamber in the tower and smothered them in their beds.

The account is incredibly detailed and chilling, describing how the hitmen suddenly lapped them up among the bedclothes, sober-wrapped them and entangled them, keeping them down by force, the feather bed and pillows hard unto their mouths, until their breath failing, they gave up, to God, their innocent souls, into the joy of heaven.

Now, we have to say, obviously, Richard was in charge of Edward's security as his Lord Protectorate,

So it's incredibly unlikely that anyone else could have got into the boys' inner chambers without Richard knowing about it.

Or, as the case may well have been, without him ordering it himself.

So if the boys were killed in the tower, it's almost certain that Richard was behind it.

But long before that, another discovery also seemed to support Moore's version of events.

In 1674, nearly 200 years after the princes vanished, workmen excavating the tower found a box containing two sets of children's bones at the foot of an old suitcase.

See, right, Hannah?

Are they still in there?

And this box was found in the exact spot where Thomas Moore claimed that the boys were buried.

Now, Moore did also say their remains were later moved to a, quote, better place.

But still, the coincidence was enough to make people pretty bloody excited.

And we also have to say the king at the time, Charles II, obviously thought the bones were the real deal.

He had them interred with full pomp and ceremony in Westminster Abbey.