Some 2,500 years ago the Battle of Marathon in Greece marked the victory of ancient Athens over the invading Persians.
It was a turning point in history - the outcome ensured the subsequent flowering of ancient Greek culture, the legacy of which is still felt today.
One of the legends of the battle is the story of a messenger who is said to have run a vast distance from the town of Marathon, across ancient Greece.
Barnaby Phillips reports on a woman who has attempted to repeat the historical feat.
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