Jaehaerys Targaryen

The message bore not the royal seal but the device of the Master of Whispers. Yet the letter bore the king's signature.

I used to rule the world
Seas would rise when I gave the word
Now in the morning I sweep alone
Sweep the streets I used to own
I used to roll the dice
Feel the fear in my enemy's eyes
Listen as the crowd would sing:
"Now the old king is dead! Long live the king!"
One minute I held the key
Next the walls were closed on me
And I discovered that my castles stand
Upon pillars of sand, pillars of sand
I hear Jerusalem bells a ringing
Roman Cavalry choirs are singing
Be my mirror, my sword, and shield
My missionaries in a foreign field
For some reason I can't explain
Once you go there was never, never an honest word
That was when I ruled the world
It was the wicked and wild wind
Blew down the doors to let me in.
Shattered windows and the sound of drums
People couldn't believe what I'd become
Revolutionaries wait
For my head on a silver plate
Just a puppet on a lonely string
( Oh, who would ever want to be king? )