The Abbasids defeated the Umayyads to claim the caliphate and leadership of the Muslim world in 750. The Abbasids based their legitimacy as rulers on their descent from the prophet Muhammad’s extended family, not as with some Shi’i directly through the line of Ali and his sons. The Abbasids attempted to reunify Muslims under the banner of the Prophet’s family. Many Abbasid supporters came from Khurasan in eastern Iran. Following the Arab conquest of the Sassanid Empire, a large number of Arab settlers had moved into Khurasan and had integrated with the local population. Consequently, many Abbasids spoke Persian but were of Arab ethnicity. THE NEW CAPITAL OF BAGHDAD The first Abbasid caliph, Abu al-Abbas (r. 749–754),...
WARFARE During 600–1450, military technology throughout Eurasia retained the principal characteristics of earlier times. Iron and steel weapons had long since replaced those made of bronze. In large empires such as those of China and the Byzantine, Persian, and Islamic Empires, large-scale industrial production of weapons became commonplace. Japan, Damascus in present-day Syria, and Toledo in Spain were famous centers for the production of swords. Refinements and improvements were continuously made to older inventions, such as poison gas and smoke bombs. The crossbow was first manufactured in China in the fourth century b.c.e. and possibly in Greece about the same time and then disappeared in Europe. It reappeared in western Europe in the 10th century (some scholars suggest, reintroduced through Central ...