Oh, Castlereagh! thou art a patriot now; 
Cato died for his country, so didst thou: 
He perish'd rather than see Rome enslaved, 
Thou cutt' st thy throat that Britain may be saved! 
So Castlereagh has cut his throat!--The worst 
Of this is, - that his own was not the first. 
So He has cut his throat at last!--He! Who? 
The man who cut his country's long ago.
George Gordon Byron
http://www.poemhunter.com/poem/epigrams/