The Mirdasid dynasty was an Arab dynasty that controlled the Emirate of Aleppo more or less continuously from 1024 until 1080.
The Mirdasids were members of the Banu Kilab, an Arab tribe that had been present in northern Syria for several centuries. Like the other Arab tribes of the region, the Mirdasids were Shi'a Muslims. Such Arab tribes were susceptible to the propaganda of the Qarmatians, who denounced the wealth of the urban Sunni population. As a result, they were given to Shia sympathies. However, as a result of the expansion of the Seljuk Turks into the area they were constrained to convert to Sunni Islam under Rashid al-Dawla Mahmud.
Unlike other Arab tribes of Syria that managed to establish their autonomy or independence in the late 10th/early 11th centuries, the Mirdasids focused their energies on urban development. As a result, Aleppo prospered during their reign. The Mirdasids demonstrated a high degree of tolerance to Christians, favoring Christian merchants in their territories and employing several as viziers. This policy, no doubt influenced by comparatively good relations with the Christian Byzantine Empire, often upset the Muslim population.
The early history of the Mirdasid dynasty is characterized by constant pressure from both the Byzantines and the Fatimids of Egypt. By mixing diplomacy (the Mirdasids were vassals of both the Byzantines and Fatimids several times) and military force, the Mirdasids were able to survive against these two powers.
Militarily, the Mirdasids had the advantage of light Arab cavalry, and several Arab groups in the region, such as the Numayrids of Harran and their own Kilabi brethren, provided valuable assistance. Later on, the Seljuks supplanted the Byzantines and Fatimids as their primary antagonist; the Turks' light cavalry was superior to their own and the Mirdasids had a much more difficult time dealing with them. The Mirdasids had resorted to recruiting Turkish mercenaries into their armies, although this caused its own problems, as the Turks began to acquire an increased role in the government.