Nine years after Nader Shah and his forces invaded and occupied the city as part of the more easternmost parts of his Empire, he was assassinated by his own officers, causing the rapid disintegration of it. Ahmad Shah Durrani, commander of 4,000 Abdali Afghans, asserted Pashtun rule in 1747 and further expanded his new Afghan Empire. His ascension to power marked the beginning of Afghanistan. By this time, Kabul had lost its status as a metropolitan city, and its population had decreased to 10,000. Interest in the city was renewed when Ahmad Shah's son Timur Shah Durrani, after inheriting power, transferred the capital of Afghanistan from Kandahar to Kabul in 1776. Timur Shah died in 1793 and was succeeded by his son Zaman Shah Durrani. Kabul's first visitor from Europe was Englishman George Forster, who described 18th-century Kabul as "the best and cleanest city in Asia".