why is it better to be a Emperor that a king?
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Answer:
In a monarchy an emperor and king are both rulers, but the power associated with them is different. They can be compared to regional manager and the CEO of a company. An empire can have many kingdoms within it; the emperor rules the entire empire while kings (or queens) rule smaller kingdoms within the empire. While the king (like the regional manager) has total control over his territory, the emperor (like the CEO) is the one who makes the final decision for the entire region.
This distinction is not universal. There are many examples in history where large kingdoms have been called empires but have been ruled by a single monarch, a king or queen. For example, King George V, Edward VIII and George VI were all kings of the United Kingdom and emperors of India.