The world drank coffee before it drank tea. 'The world' here meaning the Middle East, Russia and Europe. One battlefront in this great transition was Iran. And this commercial battle was waged ferociously from the 18th into the 19th centuries. Opium has a key role in this story. So does the Samovar.  And so does politics. Coffee houses from London to Tehran made governments uneasy – citizens met and talked and plotted there – but tea houses frightened governments even more. The story of the history of tea in Iran is tied up in geopolitics and trade relationships between Iran, Russia and China and Britain.

Guest:

• Rudi Matthee - John and Dorothy Munroe Distinguished Professor of History at the University of Delaware

Books: The Pursuit of Pleasure: Drugs and Stimulants in Iranian History, 1500-1900; The Politics of Trade in Safavid Iran: Silk for Silver, 1600-1730; Persia in Crisis: The Decline of the Safavids and the Fall of Isfahan; and most recently, Angels Tapping at the Wine-shop's Door: A history of Alcohol in the Islamic World