Just a puppet on a lonely string
Oh who would ever want to be king?

from Coldplay – Viva la Vida Lyrics on Rap Genius

Meaning

As a head of state, you are beholden to the interests of those whose support you need to maintain power. Thus being a monarch can be like being a puppet on a string.

This also alludes to the Greek legend of Damocles

“That sword! That sword!” cried Damocles. He was so badly frightened that he dared not move. “Yes,” said Dionysius, “I know there is a sword above your head, and that it may fall at any moment. But why should that trouble you? I have a sword over my head all the time. I am every moment in dread lest something may cause me to lose my life.”

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