which in his system meant the common usage of Madina. Undoubtedly Ibn Malik's position was theoretically sound: the Islamic state had taken form at Madina and nothing could give so clear light on the policy of the Prophet and his companions as the local customary law of the mother city. At the same time Ibn Malik took tradition quite seriously, indeed, the critical and scientific treatment of tradition begins with his manual known as the Muwatta. To-day Ibn Malik's school prevails in Upper Egypt and North Africa west of Egypt. The third authority ash-Shafi'i (d. 204) takes an intermediate position between Abu Hanifa and Ibn Malik, interpreting ijma as the general usage of Islam, and not of the city of Madina alone. The fourth authority, Ahmad b. Hanbal (d. 241), shows an entirely reactionary position which reverted to a close adherence to Qur'an and tradition; it carried great weight amongst the orthodox, especially in Baghdad, but now survives only in remote parts of Arabia.
In the sphere of the arts and crafts, our best evidence lies in architecture and engineering. In these the Arabs had no skill and were conscious of their incapacity. The earliest mosques were simply enclosures surrounded by a plain wall, but a new type was developed under the first 'Umayyad Khalif Mu'awiya, who employed Persian non-Muslim builders in the construction of the mosque at Kufa, and they worked on the lines of the architecture already used by the Sasanid kings. In this mosque the traditional square
