Definition
A dynasty is a sequence of rulers who all belong to the same family. Power passes down by hereditary succession — usually from a ruler to a child or close relative — so the throne stays within one bloodline across several generations or even centuries.
Dynasties have organized political power across much of world history, from the pharaohs of ancient Egypt to the imperial houses of China and the royal families of Europe. Historians often divide a country's past into the spans of its successive ruling dynasties.
Why it matters
How it works
A dynasty begins when one family seizes or is granted ruling authority and establishes the principle that power will pass to its heirs. A clear rule of succession — often to the eldest son — was meant to prevent the chaos and civil war that disputed thrones could bring.
In practice, dynasties rose and fell. A strong founder might be followed by capable heirs, but later generations could grow weak, divided, or unpopular, opening the way for rebellion or conquest. In China, this familiar arc was explained by the Mandate of Heaven; elsewhere it was simply the rhythm of dynastic history.