Is there anything useful, besides executing and ransoming, that I can do with an imprisoned liege?

Is there anything useful, besides executing and ransoming, that I can do with an imprisoned liege? - Crop unrecognizable man cleaning computer system unit

I've been playing as a Duke in the HRE, and I've managed to imprison my liege (the emperor). However, now that he's here, I really don't know what to do with him. My goal right now is to lower crown authority so I can annex some of my weaker neighbors, so if there was any way I could use this to help with that, it would be great.






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Is there anything useful, besides executing and ransoming, that I can do with an imprisoned liege? - Full body of mature African American bearded businessman in blue trousers and light shirt with maroon tie sitting on ground at brick wall and drinking beverage from tin can
Is there anything useful, besides executing and ransoming, that I can do with an imprisoned liege? - Tin vessels and metal bucket with milk placed near bike leaned on shabby rusty wall
Is there anything useful, besides executing and ransoming, that I can do with an imprisoned liege? - Orange and White Dr Pepper Can on Black Wooden Table





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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Anete Lusina, Nicola Barts, Plato Terentev, Erik Mclean