(Dowager) Queen Margaret is an interesting character who's never had any comic space to herself and I'm not sure that's ever going to change. Once Julian was old enough to fend for himself at the castle, she moved out to her family's estate because she never got along with her husband (the king) and he stepped out on their marriage often and there was no reason for her to stick around. Once Julian realized the way things were going to go, he left Brightwater, picked up his mother, and went to the fortress to let the inevitable happen.