Hasanids in the context of "Idris I of Morocco"

Alids (Arabic: العلويين, romanized: al-ʿAlawiyyīn) are those who claim descent from Ali, the fourth Rashidun caliph (r. 656–661), the first imam in Shia Islam. Ali was also the cousin and son-in-law of the Islamic prophet Muhammad.

The main branches are the Hasanids and Husaynids, named after Hasan and Husayn, the eldest sons of Ali from his marriage to Fatima, the daughter of Muhammad. As the progeny of Muhammad, they are revered by all Muslims. The Alids have led various movements in Islam, and a line of twelve Alids are the imams in Twelver Shia, the largest Shia branch.

The Hashemites (Arabic: الهاشميون, romanized: al-Hāshimiyyūn), officially the House of Hashim, are the royal family of Jordan, which they have ruled since 1921, and were the royal family of the kingdoms of Hejaz (1916–1925), Syria (1920), and Iraq (1921–1958). The family had ruled the city of Mecca continuously from the 10th century, frequently as vassals of outside powers, and ruled the thrones of the Hejaz, Syria, Iraq, and Jordan following their World War I alliance with the British Empire.

The family belongs to the Dhawu Awn, one of the branches of the Ḥasanid Sharifs of Mecca, also referred to as Hashemites. Their eponymous ancestor is traditionally considered to be Hashim ibn Abd Manaf, great-grandfather of the Islamic prophet Muhammad. Another claimed ancestor is Ali ibn Abi Talib, the usurped successor of the prophet Muhammad according to Shia Islam. The Ḥasanid Sharifs of Mecca (from whom the Hashemite royal family is directly descended), including the Hashemites' ancestor Qatadah ibn Idris, were Zaydī Shīʿas until the late Mamluk or early Ottoman period, when they became followers of the Shāfiʿī school of Sunnī Islam.

The Husaynids (Arabic: بنو الحسين, romanized: Banū al-Ḥusayn or حسینیون, Ḥusayniyyūn) are a branch of the Alids who are descendants of Husayn ibn Ali, a grandson of the Islamic prophet Muhammad. It is one of the two main branches of the ashrāf (the other being the descendants of Husyan's brother Hasan, the Hasanids).

Sharīf or Sherif (Arabic: شريف, 'noble', 'highborn'), also spelled shareef, feminine sharīfa (شريفة), plural ashrāf (أشراف), shurafāʾ (شرفاء), or (in the Maghreb) shurfāʾ, is a title used to designate a person descended, or claiming to be descended, from the family of the Islamic prophet Muhammad (c. 570 CE – 632 CE). It may be used in three senses:

1. In the broadest sense, it refers to any descendant of Muhammad's great-grandfather Hashim (the Banu Hashim or Hashimites, already in Muhammad's day an established clan within the Meccan tribe of the Quraysh), including all descendants of Muhammad's paternal uncles Abu Talib (the Talibids) and al-Abbas (the Abbasids).
2. More often, it refers to a descendant of Ali, a son of Abu Talib and a paternal cousin of Muhammad (the Alids), especially but not exclusively through Ali's marriage with Muhammad's daughter Fatima (the Fatimids). In the sense of descendants of Fatima and Ali (the most common one), the term effectively refers to all descendants of Muhammad.
3. In the narrowest sense, it refers only to someone who descends from Fatima and Ali's eldest son (and Muhammad's grandson) Hasan (the Hasanids). In this limited context, it is contrasted with the term sayyid ('lord', 'master', plural sāda, (سادة), which then refers only to the descendants of Hasan's younger brother Husayn (the Husaynids).

The precise usage of the term has varied both historically and geographically.