In summary, we find an interrelated set of significant changes occurr­ing in the eleventh and twelfth centuries on a global scale. With the rise of E… - André Wink

It is a fact of immense significance that whereas in the making of Europe the conquests of Islam played the role of a powerfully effective but mostly external factor, in the East the expansion of Islam went on for more than a millennium and here, in South and large parts of Southeast Asia the association with Islam became so intimate that, as a result, we find an Indo-Islamic pattern of society and culture. (Introduction)

If institutional indeterminacy pervaded the post-nomadic empires of Hind, the peripatetic exercise of power was another feature which they all seem to have shared. Muhammad bin Tughluq spent the greater part of his life in military camps. Most other rulers were often on campaign, sometimes for one or two years, or more, particularly in the late thirteenth and fourteenth centuries, when com munications could be broken off with the capital for months or a whole year. Firuz Shah Tughluq stayed away on a campaign to Bengal and Orissa for two years and seven months, losing his way on the return journey through jungles and mountains, when for six months there was no news from him and the viceregent had great difficulty keeping things under control. The same Sultan got lost in the Rann of Cutch, and was again cut off from Delhi for six months, altogether spending two-and-a-half years on the trip, while the viceregent pretended he had good news.

By the time that the Turko-Islamic conquerors arrived in North India, in the eleventh to thirteenth centuries, Buddhism was no longer a religion of a floating population of itinerant monks but had become institutionalized in monasteries, which, supported by royal endowments of land as well as by donations from the mercantile communities, tended to become large academically oriented centres with permanent residents, vulnerable to outside attack, but still aloof from the rural masses (which only adopted random cultic elements from the religion). What happened, then, during the Islamic conquest, is that the academic (and soteriological / philosophical) tradition of Buddhism was uprooted in India itself, but replaced, outside the orbit of Muslim rule, by a variety of regional forms of Buddhism.