sentences:  The persecution lasted for twenty months before Emperor Xuanzong ascended the throne and put forth a policy of tolerance in 846.Several reasons led to the proscriptions, among them the accumulated wealth by the monasteries and the case that many people entered the Buddhist community to escape military service and tax duty, which lasted through the Song Dynasty.The increase in the number of temples and priests and nuns put financial pressure on the state, which prompted the successive dynasties to regulate Buddhism.