Dost Mohammad Khan Barakzai, nicknamed the Great Emir, was the founder of the Barakzai dynasty and one of the prominent rulers of Afghanistan during the First Anglo-Afghan War. With the decline of the Durrani dynasty, he succeeded his brother Sultan Mohammad Khan, and became the Emir of Afghanistan in 1826. An ethnic Pashtun, he belonged to the Mohammadzai branch of the Barakzai tribe. He was the 11th son of Payandah Khan, chief of the Barakzai Pashtuns, who was killed in 1800 by King Zaman Shah Durrani.