“ 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 was recognized 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. ”