Hindustan is derived from the Modern Persian word Hindū. In Old Persian, the region beyond the Indus River was referred to as Hinduš (the Iranic equivalent of Sanskrit Sindhu[3]), hence Modern Persian Hind, Hindū. This combined with the Iranic suffix -stān results in Hindustan, "land of the Hindus". By about 1st century BC, the term "Hein-tu" was used by Chinese, for referring to North Indian people.[4][5] The term came into common use under the rule of the Mughals who referred to their dominion, centered on Delhi, as 'Hindustan'.