The Knight's Cross of the Iron Cross and its higher grades were based on four separate enactments. The first enactment, of 1 September 1939 instituted the Iron Cross (), the Knight's Cross of the Iron Cross and the Grand Cross of the Iron Cross (). Article 2 of the enactment mandated that the award of a higher class be preceded by the award of all preceding classes. As the war progressed, some of the recipients of the Knight's Cross distinguished themselves further and a higher grade, the Knight's Cross of the Iron Cross with Oak Leaves (), was instituted. The Oak Leaves, as they were commonly referred to, were based on the enactment of 3 June 1940. In 1941, two higher grades of the Knight's Cross were instituted. The enactment of 28 September 1941 introduced the Knight's Cross of the Iron Cross with Oak Leaves and Swords () and the Knight's Cross of the Iron Cross with Oak Leaves, Swords and Diamonds (). At the end of 1944 the final grade, the Knight's Cross of the Iron Cross with Golden Oak Leaves, Swords, and Diamonds (), based on the enactment of 29 December 1944, became the final variant of the Knight's Cross authorized.
