Herrschaft und Konflikt: Konig und Adel im ottonischen Sachsen (Veroffentlichungen des Max-Planck-Instituts fur Geschichte) (Gottingen - Geschichte Einer Universitatsstadt, 76)
Karl Joseph Leyser was sent to England in 1937 when his family left Germany. He served with the British Army during the war, first in the Pioneer Corps and then in the Black Watch he was demobilised in 1945 with the rank of Captain.
He studied and then taught at Oxford, specialising in medieval Germany.
It took me a while to get into this one, but Leyser did an awesome job of analyzing the nature of kingship during the tenth and early eleventh centuries, as well as the roots of the endemic fratricidal internecine wars.