The coronation of King Athelstan took place in Kingston-upon-Thames on 4 September 925.
He was the first monarch to be crowned rather than wear a helmet and became the first king of all England.
His was the second coronation to be held in the riverside town perhaps due to its location on the border between Wessex and Mercia.
Athelstan was crowned by the Archbishop of Canterbury, Athelm.
The 11ooth anniversary is being marked by a walk from Malmesbury, where Athelstan is buried, to Kingston starting today Monday 18 August.
The Mayor of Malmesbury Cllr Stephen James will be walking the 130 miles with around fifty others.
From tomorrow, Tuesday 19 August, the route follows the Thames Path downstream from Lechlade over 11 days.
The arrival is planned for 10.30am on 4 September with the last leg being from nearby Hampton Court.
That day Kingston-upon-Thames will be marking the exact date with seven contemporary life-sized embroidery panels unveiled at 2pm in All Saints Church which is associated with the coronations
This will be followed by an address delivered by historian Tom Holland.
Walking The Thames Path by Leigh Hatts (Cicerone Press) is available direct from the publisher.