Timeline of Iranian (Persian) history from the first Russo-Persian War through the early 20th century.
1804-1813 First Russo-Persian War; Russia takes Georgia and the Caucasus
1826-1828 Second Russo-Persian War; Russian navy gets Caspian Sea access
1848-1896 Reign of Nasser al-Din Shah, modernizer king
1856-1857 Anglo-Persian War; Persia gives up claim to Herat
1881 Russia takes Turkmenistan; Britain counters with influence in Persia
1905-1911 Persian Constitutional Revolution; constitutional monarchy founded
1907 Anglo-Russian Agreement; two powers set up spheres of influence in Persia
1914-1918 World War I, Persia occupied by Russian, UK, and Ottoman Turk troops
1921 Reza Shah Pahlavi ousts Ahmad Shah in coup