DrunkenMage
Intoxicated Arch-Mage
I thought the whole concept of imperial law is that your guilty until proven innocent? How come Ulfric didn't get a chance to do that? To prove his innocence? The Empire wanted to silence Ulfric... To hush him up so that others don't see the true tyranny that the empire truly is. The fact to the matter is that people are fed up with poor leadership of the Empire, and the Empire doesn't want people being reminded just how much of a failure that they are.
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Did Ulfric kill High King Torygg? Yes.
Any act against (whether directly or indirectly, or any nonaction which results in circumstances, directly or indirectly, against) a allegiated sovereign or by a vassal to a liege, resulting (or what a reasonable person would assume would result) in physical, emotional, mental, or magical harm or injury in said sovereign or liege. The punishment for this crime will be death.
Unless Ulfric is denying he killed the High King, which he is not. What innocence is there to prove?
The only other time High Treason has been mentioned in TES, that person met with the exact same fate Ulfric was about to.