After the death of prophet (p.b.uiz.) the governor had an unsuitable and unjust treatment toward new non Arabic Muslems. They made them their partner less than themselves. Including these non Arabs were Iranian who were called Mavali. The Mavali were unsatisfy from the racial and unjust treatment of the governors.
Hazrat All (A.S.), during his short time of government, tried to settle Islam in its real position and show the ideal Islamic treatment. He did not differenciate between races such as Arabs, Iranian, Moraccon and etc.,.