Shafiʽi school in the context of "Ahl al-Hadith"

Islamic schools and branches have different understandings of Islam. There are many different sects or denominations, schools of Islamic jurisprudence, and schools of Islamic theology, or ʿaqīdah (creed). Within Sunnī Islam, there may be differences, such as different orders (tariqa) within Sufism, different schools of theology (Atharī, Ashʿarī, Māturīdī) and jurisprudence (Ḥanafī, Mālikī, Shāfiʿī, Ḥanbalī). Groups in Islam may be numerous (Sunnīs make up 87-90% of all Muslims), or relatively small in size (Ibadis, Ismāʿīlīs, Zaydīs).

Differences between the groups may not be well known to Muslims outside of scholarly circles, or may have induced enough passion to have resulted in political and religious violence (Barelvism, Deobandism, Salafism, Wahhabism). There are informal movements driven by ideas (such as Islamic modernism and Islamism), as well as organized groups with governing bodies (such as Nation of Islam). Some of the Islamic sects and groups regard certain others as deviant or not being truly Muslim (for example, Sunnīs frequently discriminate against Ahmadiyya, Alawites, Quranists, and sometimes Shīʿas). Some Islamic sects and groups date back to the early history of Islam between the 7th and 9th centuries CE (Kharijites, Mu'tazila, Sunnīs, Shīʿas), whereas others have arisen much more recently (Islamic neo-traditionalism, liberalism and progressivism, Islamic modernism, Salafism and Wahhabism), or even in the 20th century (Nation of Islam). Still others were influential historically, but are no longer in existence (non-Ibadi Kharijites and Murji'ah).

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.

Spread of Islam among Kurds started in the 7th century with the Early Muslim conquests. Before Islam, the majority of Kurds followed a western Iranic pre-Zoroastrian faith which derived directly from Indo-Iranian tradition. Some elements of this faith survived in Yezidism, Yarsanism and Kurdish Alevism. Jaban al-Kurdi and his son Meymun al-Kurdi are believed to be among the first Kurds to convert to Islam, and Khalil al-Kurdi as-Semmani was one of the first Kurdish tabi'uns. Mass conversion of Kurds to Islam didn't happen until the reign of Umar ibn Al-Khattab, second caliph of the Rashidun Caliphate between 634-644. The Kurds first came into contact with the Arab armies during the Arab conquest of Mesopotamia in 637. The Kurdish tribes had been an important element in the Sasanian Empire, and initially gave it strong support as it tried to withstand the Muslim armies, between 639 - 644. Once it was clear that the Sassanians would eventually fall, the Kurdish tribal leaders one by one submitted to Islam and their tribe members followed in accepting Islam. Today the majority of Kurds are Sunni Muslims, and there are Alevi and Shia minorities. Sunni Muslim Kurds are mostly Shafiʽis and Hanafis.