The bulk of the British force was wiped out in battle against Euric, the Visigothic king, and the survivors, including Riothamus, vanished and were never heard from, again. Ambrosius assumes High-kingship of Britain. 477 - Saxon chieftain, Aelle, lands on Sussex coast with his sons. Over next nine years, Saxon coastal holdings are gradually expanded in Sussex. 486 - Aelle and his sons overreach their normal territory and are engaged by Britons at battle of Mercredesburne.
Battle is bloody, but indecisive, and ends with both sides pledging friendship.
His son, Aesc, takes over and rules for 34 years. A generation of peace ensues. Arthur is mentioned in a Welsh poem commemorating the battle. Kingdom of Sussex passed to his son, Cissa and his descendents, but over time, diminished into insignificance. 534 - Death of Cerdic.