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John VI(John Cantacuzene) (kăn'təkyo͞ozēn`), c.1292–1383, Byzantine emperor (1347–54). He was chief minister under Andronicus III, after whose death he proclaimed himself emperor and made war on the rightful heir, John V. He was aided by the Ottoman Turks. The war allowed Stephen DušanStephen Dušan or Dushan
, c.1308–1355, king (1331–46) and czar (1346–55) of Serbia, son of Stephen Uros III. He is also known as Stephen Uros IV.
..... Click the link for more information. to build his Serbian empire. John's reign briefly quieted civil and religious strife within the empire. In 1354 he abdicated in favor of John V and retired to a monastery, where he wrote a history of the period 1320–56. A defender of the mystical theory known as Hesychasm, he was instrumental in its acceptance by the Orthodox Eastern Church.
John VI,1769–1826, king of Portugal (1816–26), son of Maria I and Peter III. When his mother became insane, John assumed the reins of government (1792), although he did not formally become regent until 1799. He joined the coalition against revolutionary France, adopted a repressive policy in Portugal, and sought the alliance of England, thus bringing on the invasion of French and Spanish forces in 1801, which quickly defeated Portugal and forced on John the humiliating Treaty of Badajoz (1801). John became completely submissive to Napoleon, but nonetheless in 1807 the French again marched against Portugal. John and the royal family fled (1807) Lisbon and arrived (1808) in Brazil, where John set up his court. After the British defeated the French in Portugal, they set up a regency to rule the country. John, however, remained in Brazil even after succeeding as king on his mother's death (1816). It was only after the overthrow of the regency in Portugal by revolution (1820) and the proclamation of a liberal constitution that John was persuaded by the British to return (1821) to Portugal. He left his son Pedro (Pedro IPedro I
(Dom Pedro de Alcântara) , 1798–1834, first emperor of Brazil (1822–31); son of John VI of Portugal. Dom Pedro was a child when the Portuguese royal family, fleeing from Napoleon's conquering French army, left Portugal for Brazil.
..... Click the link for more information. ) as regent of Brazil. After accepting the constitution, he took advantage of every opportunity to modify it. He put down temporarily an absolutist revolt headed by his wife, Queen Carlota Joaquina, and his son Dom MiguelMiguel
, 1802–66, Portuguese prince; son of John IV of Portugal and younger brother of Pedro I of Brazil. He led an unsuccessful revolt against his father in 1824. On John's death (1826) the Portuguese succession was in dispute.
..... Click the link for more information. and in 1825 recognized Brazilian independence (proclaimed in 1822). On his death John left the regency of Portugal to his daughter Isabel, who recognized Pedro as Peter IV of Portugal.
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