To the Shiites he is a martyr, being believed to have been poisoned by Mamun.
Selim determined on war with Persia, where the heresy was the prevalent religion, and in order that the Shiites in Turkey should give no trouble during the war, "measures were taken," as the Turkish historian states, which may be explained as the reader desires, and which proved fully efficacious.
' Abul Hassan Ali, al Reza, commonly known as Imam Reza, the eighth imam of the Shiites, a son of Musa al Kazim, the seventh imam, was the leader from whom the party of the Alids (Shiites) had such hopes under the caliphate of Mamun.
The hidden imam of the common Shiites is, however, the twelfth imam, Mahommed Abu`l-Qasim, who disappeared mysteriously in 879.
1420, and is held in great veneration by all Mussulmans, and especially by Shiites, because it is supposed to be the tomb of Ali, the son-in-law of Mahomet.