Qadiriyyah

Qadiriyyah (also transliterated Kadri, Elkadry, Kadray, Qadiri or Qadri), is one of the oldest Sufi tariqas. It derives its name from Abdul-Qadir Gilani (radi Allah anhu) (also transliterated as "Jil lani" or "Jailani" and "Jilali" in the Maghreb) AH 470 (1077-1166), a native of the Iranian province of Gilan. In 1134 he was made principal of a Sunni Hanbalite school in Baghdad.
His contribution and renown in the sciences of Sufism and Sharia was so immense that he became known as the spiritual pole of his time, al-Gauth al Azam (the "Supreme Helper" or the "Mightiest Succor"). His writings were similar to those of al-Ghazali in that they dealt with both the fundamentals of Islam and the mystical experience of Sufism.
The Order is the most widespread of the Sufi Orders in the Islamic world and can be found in Afghanistan, India, Bangladesh, Pakistan, Turkey, the Balkans, China, as well as much of the East and West Africa, like Morocco.[citation needed]
There are even small groups in Europe and the Americas. The famous traveller and writer Isabelle Eberhardt also belonged to the Qadiri order.

http://www.aulia-e-hind.com/dargah/Intl/GausPak.htm