@GEORGE_OTKAU22 Probably because Julia's cray cray before they can start to notice that Duke Fez is doing sht to her.
And that probably they did try to protect her but theyre just getting in her way so they were locked up.
Plus, shes strong too. Getting on her bad side while shes out of her mind would not be a good option. And that Duke Fez as mentioned, was encouraging her actions
So what the knight did since he cannot defeat Julia by just killing her, he gathered people to bring things to light and started a rebellion.
Probably too that they trusted her too much and avoided the red flags until it was too late.