Input (grade 13): 651: Last Sassanid ruler Yazdegerd III then fled eastward from one district to another, until at last he was killed by a local miller for his purse at Merv (present-day Turkmenistan), ending the dynasty.
Output (grade 6): 651: Last Sassanid ruler Yazdegerd III murdered at Merv, present-day Turkmenistan, ending the dynasty.