What happened on this land around c. 1815–1880 CE (19th century imperial pressures)?

Loss of Caucasian territories to Russia; increasing British involvement in the south (Persian Gulf) and gradual political/economic concessions to European powers.
Rulers
Qajar dynasty
1794–1925
Weak Qajar central authority; rising European (Russian/British) influence.
Battles
Russo-Persian War (1826–1828)
1826–1828
War leading to Treaty of Turkmenchay and further territorial losses in the Caucasus.