The defeat in Kairouan diminished the power of the Marinids, who slipped into a period of decline. In the West Maghreb, the Marinids are not able to control the entire population. The Arab tribes grow more restless, the tax receipts decline and the sultans lose their power in favour of the Arab viziers, who are representatives of a real caste of high officials which take control of the kingdom and declare themselves as sultans themselves.