HASAN AND HOSAIN (or HUSEIN)  , sons of the fourth Mahommedan caliph Ali by his wife Fatima, daughter of Mahomet . On Ali's death Hasan was proclaimed caliph, but the strength of Moawiya who had rebelled against Ali was such that he resigned his claim on condition that he should have the disposal of the treasure stored at Kufa, with the revenues of Darabjird . This secret negotiation came to the ears of Hasan's supporters, a mutiny broke out and Hasan was wounded . He retired to Medina where he died about 669 . The story that he was poisoned at Moawiya's instigation is generally discredited (see CALIPHATE, sect . B, § I) . Subsequently his brother Hosain was invited by partisans in Kufa to revolt against Moawiya's successor Yazid . He was, however, defeated and killed at Kerbela on the loth of October (Muharram) 68o (see CALIPHATE, sect . B . § 2 ad init.) . Hosain is the hero of the Passion Play which is performed annually (e.g. at Kerbela) on the anniversary of his death by the Shiites of Persia and India, to whom from the earliest times the family of Ali are the only true descendants of Mahomet . The play lasts for several days and concludes with the carrying out of the coffins (labia) of the martyrs to an open place in the neighbourhood .

See

Sir \Vm . Muir, The Caliphate (1883); Sir Lewis Pelly, The Miracle Play of Hasan and Ilosein (1879) .