Historians believe they have uncovered the final resting place of another English monarch.
Edmund, the last king of East Anglia, was killed by invading Vikings in around 869 AD.
He was buried in Bury St Edmunds - which takes its name after him - but the location of his grave was lost after the town's abbey was destroyed.
It is thought he might be buried beneath tennis courts in the grounds of the Cathedral.
Watch Matthew Hudson's report.