There is a politically charged historical debate on the exact nature of Sino-Tibetan relations. Most historians agree that, with the exception of the Yuan administrative rule (approximately 1270–1354) and several Mongol invasions in the 13th and 17th centuries, Tibet was an independent state for most of history up to and including the Chinese Ming dynasty (1368-1644). Most historians agree that in the eighteenth century the Manchu Qing dynasty (1644-1911) established protectorate over Tibet. This began with the Chinese expedition to Tibet (1720) during the Dzungar–Qing Wars, and it marked the first time that Tibet was controlled by central government.