The Emirate of Bukhara (, ) was a Muslim polity in Central Asia that existed from 1785 to 1920 in what is modern-day Uzbekistan, Tajikistan, Turkmenistan and Kazakhstan. It occupied the land between the Amu Darya and Syr Darya rivers, known formerly as Transoxiana. Its core territory was the fertile land along the lower Zarafshon river, and its urban centres were the ancient cities of Samarqand and the emirate's capital, Bukhara. It was contemporaneous with the Khanate of Khiva to the west, in Khwarazm, and the Khanate of Kokand to the east, in Fergana. In 1920, it ended with the establishment of the Bukharan People's Soviet Republic. History The Emirate of Bukhara was officially created in 1785, upon the assumption of rulership by the Manghit emir, Shah Murad. Shahmurad, formalized the family's dynastic rule (Manghit dynasty), and the khanate became the Emirate of Bukhara. As one of the few states in Central Asia after the Mongol Empire not ruled by descendants of Genghis Khan (besides the Timurids), it staked its legitimacy on Islamic principles rather than Genghisid blood, as the ruler took the Islamic title of Emir instead of Khan. In the 18th-19th centuries, Khwarazm (Khiva Khanate) was ruled by the Uzbek dynasty of Kungrats. Over the course of the 18th century, the emirs had slowly gained effective control of the Khanate of Bukhara, from their position as ataliq; and by the 1740s, when the khanate was conquered by Nadir Shah of Persia, it was clear that the emirs held the real power. In 1747, after Nadir Shah's death, the ataliq Muhammad Rahim Bi murdered Abulfayz Khan and his son, ending the . From then on the emirs allowed puppet khans to rule until, following the death of Abu l-Ghazi Khan, Shah Murad assumed the throne openly. Fitzroy Maclean recounts in Eastern Approaches how Charles Stoddart and Arthur Conolly were executed by Nasrullah Khan in the context of The Great Game, and how Joseph Wolff, known as the Eccentric Missionary, escaped their fate when he came looking for them in 1845. He was wearing his full canonical costume, which caused the Emir to burst out laughing, and "Dr Wolff was eventually suffered to leave Bokhara, greatly to the surprise of the populace, who were not accustomed to such clemency." In 1868, the emirate lost a war with Imperial Russia, which had aspirations of conquest in the region. Russia annexed much