A memoir is known to be only experiences that's based on its writer in terms of what they can remember during that time. Therefore, you cannot say that this is not totally related to past events in history, but rather past experiences that a person that might be in history has remembered.
Only for the royal family
Mr. Grave wanted the other members of the donner party to eat the flesh of his body once he died, so they could live. They were put into horrible conditions and their supplies were already run out weeks ago. To the group of pioneers it seemed that there was nothing to do for living but kannibalism, so they ate fleshes of the dead. Therefore, Mr. Grave was ready to make such a sacrifice, hoping that he can save lives.
Answer:
they are many but one of them is awful
