Our shared history is filled with tales of kings and queens from a Norman conqueror to a regal empress.
Among them, no British ruler is shrouded in as much mystery as King Arthur.
We all know the tales of Excalibur, Camelot and the Holy Grail.
But did the fabled ruler really exist?
Richard Earl of Cornwall was the younger brother of King Henry III and one of the wealthiest men in Europe.
Around 1233, he eagerly exchanged three of his manors for a small seemingly undesirable piece of land on the north Cornish coast.
It was the island of Tintagel, a harsh rocky headland entirely unsuitable for building on.
So why was the Earl of Cornwall so keen to own it?
A century earlier in the 1130s, a cleric named Geoffrey of Monmouth has written a book chronicling 2000 years of the nation's rulers.
He called it the Historia Regum Britanniae or History of the Kings of Britain.
