An emperor's manual for ruling his empire

My Empire stretches ALL the way from the sunny Mediterranean to northern Europe.

Yes I can see you're impressed so I will tell you how I keep it under the all-powerful imperial thumb. Need more riches Conquer more lands. Plagued by plotters and traitors Banish them to freezing Britain. Want to be remembered forever Build mighty arches and gorgeous villas. And by the way I'm street-wise too - so there are no unruly mobs out there.

I give the plebs quite enough bread though gritty and declare public holidays sometimes with gladiatorial treats in the arena.

You must agree this is a brilliant plan for endless empire and glory...what could possibly go wrong