How dynasties rise: conditions and legitimacy

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Because the old order has weakened AND a challenger can gather people, money and a mobilising cause — usually several conditions combining at once.

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Political (a weak or illegitimate regime), social (excluded, discontented groups), economic (control of wealth/trade), and religious/ideological (a faith or descent claim as a cause).

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A gap in authority left when the old regime is too weak, divided or illegitimate to hold control — an opening a challenger can exploit.

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The Umayyads, in 750, decisively at the Battle of the Zab.

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Non-Arab Muslim converts who were taxed and treated as second-class under the Umayyads; the Abbasids mobilised them as a support base.

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The Umayyad regime was weakened by civil wars, succession disputes and factionalism, leaving a power vacuum.

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Control of the gold–salt trade — West African gold exchanged for Saharan salt — which paid for its armies and dominance.

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They claimed descent from the Prophet Muhammad's uncle al-Abbas and cast the revolt as restoring rule to the Prophet's family — a sacred cause.

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The accepted right to rule that people recognise as valid — the idea a ruler uses to justify holding the throne.

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A Chinese idea that Heaven grants rule to a just ruler and withdraws it from an unjust one; a rebel who wins proves he now holds it.

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Dynastic descent = right passes down a bloodline (e.g. Abbasid claim). Divine kingship = the ruler himself is sacred or god-like.

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Cause-and-effect: don't just list conditions — explain how they combined so a rebellion or succession succeeded rather than failed, then judge which mattered most.