Nodyn:Rhestrau'r 19eg Ganrif yng Nghymru
1800au: 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 - 1810au: 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 - 1820au: 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 - 1830au: 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 - 1840au: 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 - 1850au: 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 - 1860au: 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 - 1870au: 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 - 1880au: 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 - 1890au: 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899