These domestic troubles were followed by a serious rebellion in Kokonor, which was not fully suppressed until the next reign; also by an outbreak among the aborigines of Kueichow and Yünnan, which lasted until three years later, when the tribesmen were brought under Imperial rule. A Portuguese envoy, named Magalhaens (or Magaillans), visited Peking in 1727, bearing presents for the Emperor; but nothing very much resulted from his mission. In 1730, in addition to terrible floods, there was a severe earthquake, which lasted ten days, and in which one hundred thousand persons are said to have lost their lives. In 1735, Yung Chêng's reign came to an end amid sounds of a further outbreak of the aborigines in Kueichow. Before his death, he named his fourth son, then only fifteen, as his successor, under the regency of two of the boy's uncles and two Grand Secretaries, one of the latter being a distinguished scholar, who was entrusted with the preparation of the history of the Ming dynasty. Yung Chêng's name has always been somewhat unfairly associated by foreigners with a bitter hostility to the Catholic priests of his day, simply because he refused to allow them a free hand in matters outside their proper sphere. Altogether, it may be said that he was a just and public-spirited ruler, anxious for his people's welfare. He hated war, and failed to carry on his father's vigorous policy in Central Asia; nevertheless, by 1730, Chinese rule extended to the Laos border, and the Shan States paid tribute. He was a man of letters, and completed some of his father's undertakings. Yung Chêng's successor was twenty-five years of age when he came to the throne with the year-title of Ch'ien Lung (or Kien Long = enduring glory), and one of his earliest acts was to forbid the propagation of Christian doctrine, a prohibition which developed between 1746 and 1785 into active persecution of its adherents. The first ten years of this reign were spent chiefly in internal reorganization; the remainder, which covered half a century, was almost a continuous succession of wars. The aborigines of Kueichow, known as the Miao-tz[)u], offered a determined resistance to all attempts to bring them under the regular administration; and although they were ultimately conquered, it was deemed advisable not to insist upon the adoption of the queue, and also to leave them a considerable measure of self-government. Acting under Manchu guidance, chiefs and leading tribesmen were entrusted with important executive offices; they had to keep the peace among their people, and to collect the revenue of local produce to be forwarded to Peking. These posts were hereditary. On the death of the father, the eldest son proceeded to Peking and received his appointment in person, together with his seal of office. Failing sons or their children, brothers had the right of succession.