In the Muslim parts of the Horn of Africa, "sheikh" is often used as a noble title. In Somali society, it is reserved as an honorific for senior Muslim leaders and clerics ("wadaad"), and is often abbreviated to "Sh". Famous local sheikhs include Ishaaq bin Ahmed, an early Muslim scholar and Islamic preacher, Abdirahman bin Isma'il al-Jabarti, an early Muslim leader in Somaliland; Abadir Umar Ar-Rida, the patron saint of Harar; Abd al-Rahman al-Jabarti, Sheikh of the riwaq in Cairo who recorded the Napoleonic invasion of Egypt; Abd Al-Rahman bin Ahmad al-Zayla'i, scholar who played a crucial role in the spread of the Qadiriyyah movement in Somalia and East Africa; Shaykh Sufi, 19th century scholar, poet, reformist and astrologist; Abdallah al-Qutbi, polemicist, theologian and philosopher best known for his five-part "Al-Majmu'at al-mubaraka" ("The Blessed Collection"); and Muhammad Al-Sumaalee, teacher in the Masjid al-Haram in Mecca who influenced many of the prominent Islamic scholars of today.