 The region remained under the control of Caedwalla's successor Ine in the early 8th century.Its political history for most of the 8th century is unclear, although West Saxon control may have broken down around 722, but by 784–785 it had passed into the hands of King Offa of Mercia.Mercian rule continued until 825, when following his victory over the Mercians at the Battle of Ellandun, King Egbert of Wessex seized control of Surrey, along with Sussex, Kent and Essex.