It means that a king (already) has everything he wants, at least as far as is possible. His (fear)(problem) is that he could lose his high position and good life, or even lose his life. The above can refer to a real king, but it can also refer to anyone who has a good life and many possessions.
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gloriacollinsThe quote signifies that all kings have to fear many things and they do not have any hope in life..