The warrior ascetics were institutionalized as a religious order by Gorakhnath and were expanding in the 13th century, after the establishment of the first Islamic Sultanate in India. They interacted and cooperated with "fakirs" of Sufi Muslims. The yogis feature prominently in Delhi Sultanate and Mughal Empire period official documents, states David White, both in terms of impressing the ruling elite in the Muslim administration and awards of receiving land grants in some cases such as by Akbar, as well as those yogis who targeted the elite merchants and disrupted the business of administrative Islamic elites in urban areas. In other cases, yogis from the Shaivism, Vaishnavism and Shaktism traditions of Hinduism marshaled armed resistance against the Mughal and British colonial armies.