JOHN VI  . (1769-1826), king of Portugal, was born at Lisbon on the x3th of May 1769, and received the title of prince of Brazil in 1788 . In 1792 he assumed the reins of government in name of his mother Queen Mary I., who had become insane . He had been brought up in an ecclesiastical atmosphere, and, being naturally of a somewhat weak and helpless character, was but ill adapted for the responsibilities he was thus called on to undertake . In 1799 he assumed the title of regent, which he retained until his mother's death in 1816 . (For the political history of his regency, see PORTUGAL.) In 1816 he wasrecognized as king of Portugal but he continued to reside in Brazil; the consequent spread of dissatisfaction resulted in the peaceful revolution of 1820, and the proclamation of a constitutional government, to which he swore fidelity on his return to Portugal in 1822 . In the same year, and again in 1823, he had to suppress a rebellion led by his son Dom Miguel, whom he ultimately was compelled to banish in 1824 . He died at Lisbon on the 26th of March 1826, and was succeeded by Pedro IV .