Zaidiyyah or
Zaidism (
Arabic: الزيدية
az-zaydiyya, adjective form
Zaidi or
Zaydi) is an early sect which emerged in the eighth century out of
Shi'a Islam, named after
Zayd ibn ʻAlī, the grandson of
Husayn ibn ʻAlī. Followers of the Zaydi
Islamic jurisprudence are called Zaydi Shi'a and make up about 35-40% of Muslims in
Yemen.