sentences:  When Mirwais died in 1715, he was succeeded by his brother, Abdul Aziz, but the Ghilji Afghans persuaded Mahmud to seize power for himself and in 1717 he overthrew and killed his uncle.In 1720, Mahmud and the Ghiljis defeated the rival ethnic Afghan tribe of the Abdalis.However, Mahmud had designs on the Persian empire itself.