He told me it had been suggested to him to write against the Emperor.

Besides, he had just grounds of offence against the Emperor.

"I will make common cause with any one against the Emperor?"

Did you, by chance, lead the gladiators in an uprising against the Emperor?

They must have wanted some weapon against the Emperor so badly.

In that poem, he incites his four uncles to war against the Emperor.

He then moved to Germany, stirring up trouble against the Emperor.

"I only slew those who rose against the Emperor."

You have yet to march against the Emperor of Austria.

In my opinion, this might mean an assassination plot against the Emperor.