Who is king Christians bodyguard number the stars?

In "Number the Stars" by Lois Lowry, King Christian X's bodyguard is named Peter Neilsen. He is a young man who works with the Danish resistance to help protect the Jewish population during the Nazi occupation of Denmark. Peter is a close friend of the Johansen family and plays a significant role in the story, particularly in supporting Annemarie Johansen and her efforts to help her Jewish friend, Ellen.