An empire is a collection of smaller kingdoms or territories over which one powerful ruler — or a group of rulers — exerts power, usually after waging war against them. The word comes from the Latin imperium, which means ‘supreme power’.
The key point is that the smaller kingdoms do not disappear. They keep their own rulers, but those rulers become tributaries of the emperor: they pay tribute — money, gold, grain, livestock, elephants or other valuables — as a sign of submission, loyalty or respect, and they accept the emperor's overlordship. The emperor governs the whole territory from a capital, which is usually the biggest centre of economic and administrative power.
Ancient Sanskrit words for ‘emperor’ say the same thing in three ways:
| Word | What it means |
|---|---|
| samrāj | ‘the lord of all’ or ‘supreme ruler’ |
| adhirāja | ‘overlord’ |
| rājādhirāja | ‘king of kings’ |