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A custom once in vogue was to seek the intercession of the so-called “Pearl Cannon” on the occasion of Charshanbe Suri. This heavy gun, which was cast by the foundry-man Ismāil Isfahāni in 1800, under the reign of Fath-Ali Shah of the Qajar dynasty, became the focus of many popular myths. Until the 1920s, it stood in Arg Square , to which the people of Tehran used to flock on the occasion of Charshanbe Suri.
