The Battle of Mercredesburne is one of three battles fought as part of the conquest of what becomes the Kingdom of Sussex in southern England.
The battles are fought between the Saxon leader Ælle's army and the local Britons.The Anglo-Saxon Chronicle states that Ælle arrived in Sussex with three ships and went on to fight at Cymenshore in 477, Mercredesburne in 485, and Pevensey in 491.
Ælle becomes the first king of the South Saxons.
The Kingdom of Sussex is eventually annexed by the Kingdom of Wessex in the 9th century and goes onto become the county of Sussex, England.
