The Pharaoh and Jerusalem

Look upon my vast domain,---
Rome trifles upon my lands
And Parthia. My economy 
Is in shambles, as the armies
Ravage the environs.
And this little city I have
So vital to my economy...
I keep having to retake it
Over and over again,
And punish its inhabitants.
But, no matter how,
They rebel, and expel my forces
From the city, and weaken my resolve.
I am conquered.