After the assassination of Nader Shah of Persia who ruled over most of what is now Afghanistan, local leader Ahmad Shah founded the Durrani Empire in 1747, centred in Kandahar and considered the beginning of modern Afghanistan. After the collapse of the empire in 1823 its flag, a green-white-green triband, remained in use in the Emirate of Herat (1818-1842).
http://worldpics.com.au/Afghanistan/flags/slides/afghanistan1747.html
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