Cynric became the ruler of Wessex after Cerdic died in 534, and reigned for twenty-six years. It is presumed that Ceawlin, who succeeded Cynric in about 581, was his son. Ceawlin's reign is thought to be more reliably documented than those of his predecessors, though the "Chronicle"'s dates of 560 to 592 are different from the revised chronology. Ceawlin overcame pockets of resisting Britons to the northeast, in the Chilterns, Gloucestershire and Somerset. The capture of Cirencester, Gloucester and Bath in 577, after the pause caused by the battle of Mons Badonicus, opened the way to the southwest.