 According to David Lorenzen, the religious groups in Hinduism that militarized and took up arms following the Muslim conquest of India, to resist persecution, appeared among the Nath or Kanphata yogis, often called simply yogis or jogis.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.