What happens to the dragon banner if I support a main faction and the faction leader ends up dying?

I’m currently +1,000 into a campaign as a vassal of the Northern Empire and I still have the dragon banner in my possession. I’m wondering what would happen to the dragon banner if I give the dragon banner to Penton (the current ruler of the northern empire) if he where to end up dying.

Would I get the dragon banner back if I became emperor of the Northern Empire? If I do get it back this way what happens to it if I die as emperor?

What happens to the dragon banner if another vassal becomes ruler?

Can you even get the dragon banner back?

submitted by /u/Immediate-Policy4461
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