Question: What was a branch of the Khalwatiyya order of Islamic mysticism founded by Sayyid Hasan Husameddin, with relations to the cousin and son-in-law of Muhammad?
Context: Mohammed El Senussi (in Arabic: سيدي محمد السنوسي) (Sayyid "Mohammed al-Rida bin Sayyid Hasan ar-Rida al-Mahdi El Senussi"; occasionally spelled as "...Al Senussi", "as-Senussi", "al/el-Senussi", and, most accurately, "al-Sanusi", born 20 October 1962) is the son of Crown Prince Hasan as-Senussi of Libya, and of Crown Princess Fawzia bint Tahir Bakeer.  Born in Tripoli, he is considered by Libyan royalists to be the legitimate heir to the Senussi Crown of Libya.  A rival claim is also advanced by his distant relative Idris bin Abdullah.  He was named Mohammed al-Rida (محمد الرضا) after his grandfather Mohammed al Rida El Senussi. In Islam, ‘Irfaan (Arabic/Persian/Urdu: عرفان ; Turkish: "İrfan" ), also spelt "Irfaan" and "Erfan", literally ‘knowledge, awareness, wisdom’, is gnosis.  Islamic mysticism can be considered as a vast range that engulfs theoretical and practical and conventional mysticism and has been intertwined with sufism and in some cases they are assumed identical.  however Islamic mysticism is assumed as one of the Islamic sciences alongside theology and philosophy.  Islamic’s mysticism is cognition and knowledge that love has been intertwined through it with structure of revelation in Islam. Sayyid (also spelled Syed, Saiyed, Seyd, Sayed, Sayyad, Sayyed, Saiyid, Seyed, Said and Seyyed) (] , Arabic: سيد‎ ‎ ; meaning "Mister") (plural "Sadah" Arabic: سادة‎ ‎ , "Sāda(h)" , also spelled "Sadat") is an honorific title denoting people (Sayyid for males, Sayyida for females) accepted as descendants of the Islamic prophet Muhammad through his grandsons, Hasan ibn Ali and Husayn ibn Ali combined Hasnain, sons of Muhammad's daughter Fatimah and his son-in-law Ali (Ali ibn Abi Talib). Ali ( ; Arabic: علي‎ , "ʿAlī " ‎ , ] ; 13 Rajab, 21 BH – 21 Ramadan, 40 AH (c. 594 – 29 January 661) was the cousin and son-in-law of Muhammad, the prophet of Islam.  He ruled as the fourth caliph from 656 to 661, and was first Imam of Shia Islam from 632 to 661. The Source of Genealogy or Manba Al-Ansāb (Arabic: منبع الانساب | Persian: منبع انساب) is a historical document outlining various topics including the genealogy of the Sayyids of Bukkur (Urdu بھاکر ی سادات) Bhakri syed and Sufism written by Sayyid Muīn Al-Haqq around 1426 AD and the Islamic year 830.  Sayyid Muīn is a notable Sayyid who descends from the Islamic prophet, Muhammad through his descendant, Ali al-Hadi.  The work was extended by a lineal sixth degree descendant of Sayyid Muīn.  Sayyid Ali Ghazanfar alias Jārullah added more information other Sayyid ancestries and other Sufi orders.  Sayyid Muīn lived in India where the book was originally written in Persian and was later translated into Urdu.  Manba Al-Ansāb can also be found in the manuscript form in The British Library and Allahabad, India. Thangals are the various Muslim communities of Yemeni Arab origin found scattered and isolated in the state of Kerala, India.  They migrated to Kerala during the 17th century to expand their business, and propagated Islam as they are Muslims, and do not belong to the Mappila Muslim community of Kerala.  In Malayalam, "thangal" is an honorific Muslim title almost equivalent to the Arabic term Sayyid (Arabic: سيد‎ ‎ ) which is given to males believed as descendants of Islamic prophet Muhammad through his grandsons, Hasan ibn Ali and Husayn ibn Ali, who were the sons of his daughter Fatima Zahra and son-in-law Ali ibn Abi Talib.  It has two basic divisions called "Ba-Hassan" and "Ba-Alawi".  Al mattari, Al-Jamallulaily(BaJamalullayl), Mashhoor, Shihab, Al-Jifri, Al-Fakhi(Bafakhy), Al-Saqqaf(BaSaggaf), Al-Bukhari, Al-Haboothy(BaHabooth) are considered as important Sayyid families (Qhabeelas).  Thangals residing in Panakkad, Malappuram district are often regarded as the most powerful and influential Thangals of Kerala.  The Thangal of Panakkad is the supreme leader of the Sunni faction of Muslims of Kerala and hence plays an important role in local politics.  The famous Sayyid ancestry Mashhoor is another well known thangals Qabeela residing in Vadakara, Kozhikode district.  Mashhoor Qabeela of vadakara is famous in sufi Tariqa which is the spiritual path of Islam. Lawrencepur is a town in Attock District Punjab, Pakistan located on the Grand Trunk Road.  Faqeerabad is a small town in Lawrencepur.  Also there is a small Bazaar,for local people.  Lawrencepur railway station , which now in these days shutdown and not in use anymore by Pakistan Railways , situated here.  Also situated here is Pakistan Broadcasting Corporation building.  A well known Islamic Institution Madrasa Astana Alia Behr-Ul-Haq Sharif and an adjacent Mosque built by Sufi Saint , Sufi Master, Qibla, Pir (Sufism) Peer e Tariqat Tariqa ,Rehbar e Shariat Sharia, Faqir Benazir, Musheer Bargah e Taqdeer, Hafiz, Qari , Molana , Khawaja, Allama , Hazrat Hadrat Sayyid Muhammad Abdul Haq Damat Baraktum Alia Qudsia also known as Baba Jee ( Baba G / Baba Gee ).  Hazrat Baba Jee Sahib is Qutb, Qutb of this time, Sufi Mystic ( Islamic mysticism ), Wali of Allah , acknowledged by various Islamic Scholars, Sufi Masters , Sufi Saints from all over the world. Omid Safi is an American Professor of Asian and Middle Eastern Studies at Duke University, where he is the Director of Duke Islamic Studies Center, and a columnist for On Being.  Dr. Safi specializes in Islamic mysticism (Sufism), contemporary Islamic thought and medieval Islamic history.  He has served on the board of the Pluralism project at Harvard University and is the co-chair of the steering committee for the Study of Islam and the Islamic Mysticism Group at the American Academy of Religion.  Before joining Duke University, Dr. Safi was a professor at the University of North Carolina Chapel Hill. Sayyid (] , Arabic: سيد‎ ‎ , also transliterated as Sayed, or Syed, ] ) is a masculine given name derived from the title Sayyid, it is not to be confused with the similar looking name Sayid (often spelled "Saeed", ] ) .  These people are not necessarily considered to be Sayyid; they only use "Sayyid" as a given name .  Some people however with the name may be considered as being Sayyid (males accepted as descendants of the Islamic prophet Muhammad through his grandsons, Hasan ibn Ali and Husain ibn Ali). Ushshaki (Turkish: "Uşşaki "Ush-shaki"" ), is a branch of the Khalwatiyya order of Islamic mysticism, also known as "Tasawwuf", founded by Sayyid Hasan Husameddin.  Literal translation of his name, Husameddin means the sharp sword of the religion.  He was born in 880 A.H. ( 1473 CE) in Bukhara, Uzbekistan.  Being the son of a merchant named Hajji Tebaruk, his family lineage extends to Imam Hassan, Caliph Ali, and eventually to the Prophet Muhammed.
Answer: Tasawwuf