In 1740, after returning from his Indian campaign, Nader Shah minted coins in the name of Shahrokh in Herat. In 1747, as Nader Shah became increasingly paranoid, he had Shahrokh sent to the fortress of Kalat. Nader Shah was soon murdered afterwards, by mutinous officers, on June 21, 1747. His death led to a power vacuum, which resulted in his vast empire being divided by various sovereigns. The eastern parts of his domain were seized by Uzbek and Afghan sovereigns; a former Uzbek commander of Nader Shah named Muhammad Rahim Khan Manghit, deposed Abu al-Fayz Khan and became the new ruler of Bukhara; Ahmad Khan, the leader of the Abdali tribe and formerly part of the Afghan cadre of Nader Shah's army, fled to the city of Naderabad in Kandahar. There he assumed the title of "Durr-i Durran" (Pearl of Pearls) and thus changed the name of his Abdali tribe to "Durrani." Ahmad Khan (now titled Ahmad Shah) then went on conquer what had originally served as the frontier region between the Safavid and Mughal Empire.