Prince Mohammad Mirza known as "Kashef-ol-Saltaneh" who was born in Lahijan was the first mayor of Tehran. As the Iranian ambassador to India under British rule, he knew the British would not allow him to learn about the secrets of tea production, as it was their biggest business in India at the time. So being fluent in French, the prince pretended to be a French laborer and started to work in the tea plantations and factories to learn how to produce tea. Ultimately his plan was to take back some samples of this tea to Iran to cultivate. He was successful in this endeavor only because of his diplomatic immunity which stopped the British from searching his secretly stashed sample. His mausoleum in Lahijan is now part of the "Iran National Tea Museum".