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Territorial Changes in the 19th and 20th Centuries. Thanks Servant.
1813: Treaty of Gulistan with Russia
1826:Treaty of Turkmenchay with Russia
1847: Treaty of Erzerum with the Ottomans
1857: Treaty of Paris ending the Anglo-Persian War
1863-1872: First and Second Goldsmid Arbitration
1881: Treaty of Akhal with Russia
1893: Iran transfers to Russia additional regions near the Atrek River that were Iranian under the Akhal Treaty.
1905: Mc Mahon Arbitration of Sistan
1971: UN plebiscite
See also Greater Iran