High Quality Content by WIKIPEDIA articles! Raidashir was younger brother to the Persian King Ardashir I of the Sassanid Dynasty. Raidashir was a bloodthirsty warrior and his elder brother feared him. He was exiled by the King for practicing a faith other than Zoroastrianism, the more popular religion in Persia at the time. Arguably, references about Raidashir appeared in many parts of the Sassanid Dynasty history; spanning from 3rd century AD till its fall in 642. It could be of different persons with the same name. However, recent studies reveal that Raidashir had created a cult of black magic practitioners whom the leader of was given the title Rai Shah. The cult grew rapidly in India after the fall of the Persian Empire to the Caliph Umar Al Khattab in 642 AD at the Battle of Nahavand. The title, Rai Shah, was changed to Raja Rai according to the local dialect at that time. The name of the cult was unknown but it was believed to be the forerunner of the ancient Indian custom of sacrificing the wife of a dead husband to the Death Goddess Kali. By the time the Muslim Moghul Empire had spread its power in the late 13th century, all the traces of the ancient cult in India had disappeared.