Arslan was enthroned in May/June 1748. His kalga was Selim, a son of Fetih II. His nureddin was his brother and future khan
Qırım Giray. Qirim was later replaced by Maksud, a son of Selyamet II. He continued to rebuild Crimea following the Russian invasions of 1736–1738. He added a west wing to his palace, strengthened
Perekop, Arabat, and other forts, and built mosques,
madrasas, and public fountains. Russia had now advanced far enough south to threaten both Crimea and Turkey. Russia pressed Turkey to press Crimea to hold down border raids. The reduction of raiding probably reduced Crimean incomes. Arslan gained control over unruly members of the Giray clan by giving them honorable posts in Crimea. The Ottomans praised him for keeping peace with Poland and Russia. In February/March 1756, he lost the throne, possibly due to intrigues in Istanbul. ==1756–1767==