His son Pagan, who became king in 1846, executed thousands – some sources say as many as 6,000 – of his wealthier and more influential subjects on trumped-up charges. During his reign, relations with the British became increasingly strained. In 1852, the Second Anglo-Burmese War broke out. Pagan was succeeded by his younger brother, the progressive Mindon. Mindon attempted to bring Burma into greater contact with the outside world, and hosted the Fifth Great Buddhist Synod in 1872 at Mandalay, gaining the respect of the British and the admiration of his own people.