Despite his lack of experience, Claudius proved a good administrator and a great builder of public works. His reign saw an expansion of the Empire, and the conquest of Roman Britain. He took a personal interest in the law, and he presided at public trials. Claudius suffered setbacks in his personal life, one of which may have led to his murder. He married four times, and the marriages did not turn out well. Claudius' relative and adopted son Nero succeeded him as emperor, and undid much of his good work.