>>280313459
I don't recall there ever being any mention of them being specifically sent by someone to help, they could be there just by their own initiative for what we know right now. We can currently only speculate what their motives are and we don't even really know who they are going to help. According to Guillaume's character sheet, he doesn't really seem to be that fond of the Kingdom, and losing his eye because of Elstri's fanatical devotion and her immoral orders to kill a child might have made him want to enact some sort of payback against the prophetess.