‘Abbasid dynasty
When the ‘abbasid dynasty came to power they were greatly aided by the shi’a minority in the Middle East. This was at least partially because the ‘abbasid dynasty based their right to power in part on bloodlines to Mohammed. However, once the dynasty was in power they embraced Sunni Islam and shunned shi’a beliefs. This change of religion led to considerable strife and widespread bloodshed in some areas.