By 686 Caedwalla was able to declare himself king. The remaining underkings in Wessex did not oppose him and kept their territories. During the three years Caedwalla reigned over Wessex he was constantly at war. He and his brother Mul ravaged Kent in 686. After subjecting Kent to his rule he left his brother Mul in charge as king of Kent. That summer he attacked Sussex and killed king Berhthun. In 687 the men of Kent rose up against Mul and he was burned with twelve of his companions. They soon restored their own royal line on the throne. Caedwalla invaded a second time and ruled Kent himself. Caedwalla next invaded the Isle of Wight. King Arwald was killed. Caewalla allowed the two young athelings of Wight, Arwald's brothers, to convert to Christianity before executing them. He then began to kill all the inhabitants and replace them with settlers from Wessex. Although still a pagan, he gave several large estates on the Isle of Wight to bishop Wilfrid. It was during his war on the Isle of Wight that Caedwalla was badly wounded. His wound seemed mortal to him. But he had succeeded in conquering most of the south-east of England. In 688 he abdicated the throne of Wessex. He was able to journey to Rome where on Easter day 689, he was baptised by Pope Sergius. About ten days later on 20 April he died and was buried in Rome. He set a precedent for the west Saxon kings who followed him to dominate all of south-east England.