Mary1776 - 1857 Born Thu, 25 April 1776 Buckingham Palace, Westminster Died Thu, 30 April 1857 Gloucester House, Westminster Buried St George's Chapel, Windsor Details Parents Princess, Duchess of Gloucester and Edinburgh Mary Lived 81 years, 4 days father George III 1738 - 1820 mother Charlotte of Mecklenburg-Strelitz 1744 - 1818 Siblings Brother George IV 1762 - 1830 Brother Frederick 1763 - 1827 Brother William IV 1765 - 1837 Sister Charlotte 1766 - 1828 Brother Edward 1767 - 1820 Sister Augusta Sophia of the United Kingdom 1768 - 1840 Sister Elizabeth of the United Kingdom 1770 - 1840 Brother Ernest Augustus 1771 - 1851 Brother Augustus Frederick 1773 - 1843 Brother Adolphus 1774 - 1850 Sister Sophia of the United Kingdom 1777 - 1848 Brother Octavius of Great Britain 1779 - 1783 Brother Alfred of Great Britain 1780 - 1782 Sister Amelia of the United Kingdom 1783 - 1810