Since the style set by the capital was used throughout the Muslim world, Baghdad and Samarra’ became associated with the new artistic and architectural trend. As virtually nothing remains from Abbasid Baghdad today, the site of Samarra’ is particularly significant for understanding the art and architecture of the Abbasid period. In Samarra’, a new way of carving surfaces, the so-called beveled style, as well as a repetition of abstract geometric or pseudo-vegetal forms, later to be known in the West as “arabesque,” were widely used as wall decoration and became popular in other media such as wood, metalwork, and pottery. In pottery, Samarra’ also witnessed an extensive use of color in decoration and, possibly, the introduction of the technique of luster painting over a white glaze. Admired for its glittering effect reminiscent of precious metal, luster painting, the most notable technical achievement at the time, spread in the following centuries from Iraq to Egypt, Syria, Iran, and Spain and eventually also contributed to the development of ceramic decoration in the Western world. In terms of architecture, along with the palace of Jawsaq al-Khaqani (ca. 836 onward), the mosques of al-Mutawakkil (848–52) and Abu Dulaf (859–61) in Samarra’ were important in setting the style that was emulated in regions as far as Egypt or Central Asia, where it was adapted to need and taste.
In the tenth century, Abbasid political unity weakened and independent or semi-autonomous local dynasties were established in Egypt, Iran, and other parts of the realm. Following the capture of Baghdad by the Buyids (932–1062) and Seljuqs (1040–1194) in 945 and 1055, Abbasid caliphs retained little more than moral and spiritual influence as the heads of Orthodox Sunni Islam. The Abbasid realm witnessed a brief revival under caliphs al-Nasir (r. 1180–1225) and al-Mustansir (r. 1226–42), when Baghdad once again became the greatest center for the arts of the book in the Islamic world and the Mustansiriyya Madrasa (1228–33), the first college for the four canonical schools of Sunni law, was built. However, this burst of artistic vitality came to a temporary halt with the sack of Baghdad by the Ilkhanid branch of the Mongols in 1258. Though surviving Abbasids fled to Mamluk Egypt, these caliphs would only have nominal influence. The end of the Abbasid caliphate thus marked the end of the universal Arab-Muslim empire.
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