Both these worlds had a trans-regional quality. The Persianate world, like the Sanskrit one, was defined by language, culture and texts. There was a large body of imaginative literature but there was also a large body of writing about power and authority. One predominant theme of these texts was the invocation of a particular conception of a universal ruler, the sultan. This political discourse, long before Renaissance and Enlightenment thinkers in Europe, had begun to theorise the separation between the Church and the State. Eaton argues that these two worlds were not tied down to any one religion and that the two worlds were not hostile. He writes, “…by the time it reached India, the term ‘sultan’ had become so detached from ethnicity or religion that Hindu rulers, aspiring to the most powerful titles then available to them, adopted it”. To continue to quote Eaton, “India’s eventual inclusion in this expanding Persianate world was thus facilitated by, among other things, a ruling ideology that had co-opted the political authority of a caliph, embraced the principle of universal justice and accommodated cultural diversity.” What was important here, and Eaton underlines this, was “the elevation of justice, not religion, as the measure of proper governance”: it was this that allowed Persianised states to flourish throughout India, notwithstanding the religion of the ruler.This book is about this interaction in which, in terms of political power, the Persianate world came to dominate for about 500 years. This period had certain significant consequences. It witnessed the disappearance of Buddhism, the rise of Sikhism, the emergence of the world’s largest Muslim society, the clearance of large acres of forests for grain cultivation, the integration of tribal clans into the Hindu social order and the growth of India as a major producer and exporter of manufactured textiles. It also saw the arrival of Europeans, not as mere travellers, but as organised trading companies, thus ushering India to a new and different encounter with the European West.