Walton castle stood near the estuary of the Deben on a site now completely eroded by the sea. The fort was the site of the first East Saxon bishopric created by the royal family the Wuffingas (630). No trace remains of the Roman or the British names for the fort.

This might indicate that the site had passed into royal hands early in the migration period. Here we are close to the East Saxon royal burial ground in the Deben valley and the Sutton Hoo site.