Umayyad and Abbasid Caliphates
The Umayyads (661-750)
Understand the shift of the capital to Damascus, the role of Mu'awiya in founding dynastic rule (mulk), the Second Fitna under Abd al-Malik, and the Arabization of administration and coinage. Know the eastern expansion to Sind (Muhammad bin Qasim, 711) and the west to Iberia (Tariq ibn Ziyad, 711), and the failed sieges of Constantinople. Master the internal tensions: the mawali (non-Arab converts), the dhimmi status, and the revolts that culminated in the Abbasid revolution of 750.
The Abbasids (750-1258)
Know Baghdad's founding by al-Mansur in 762, the Bayt al-Hikma under Harun al-Rashid and al-Ma'mun, the translation movement, and the Persian bureaucratic influence (wazir, diwan). Understand the fragmentation: Tahirids, Samanids, Buyids, and the Seljuk intervention, ending with the Mongol sack of Baghdad in 1258.
Traps
Examiners often test whether a ruler is Umayyad or Abbasid by institution rather than name. Another trap is treating the Abbasid revolution as purely Persian; Arab tribal discontent also mattered. Do not confuse the Umayyads of Damascus with the Umayyads of Cordoba (Abd al-Rahman I, 756).
Rule of Thumb
Classify by capital and century: Damascus (7th-8th) means Umayyad; Baghdad (8th-13th) means Abbasid; Cordoba (756 onward) means a separate Umayyad emirate. Example: the Bayt al-Hikma belongs to Abbasid Baghdad, not to Damascus.