Builders working on an Oxfordshire highway have uncovered 1,000-year-old ruins built by a Norman adventurer.
Robert d'Oilly built a huge castle in the centre of Oxford
Workmen found part of a Norman causeway and arches under Abingdon Road and archaeologists were called in.
The road has now reopened after six weeks and it is hoped the ruins will go on show to the public.
It is believed the remains are part of the great Grandpont causeway built by Robert d'Oilly, an Oxford nobleman who fought at the Battle of Hastings.
In 1071, d'Oilly built a huge castle on the west side of Oxford, much of which was destroyed in the 17th Century.
Some however has survived to the present day, including the St George's Tower.
The next stage of improvements to the road will be in the Folly Bridge area during the school summer holidays.