Promantic Proof from the Number Four

A woodcut illustration depicts nine distinct categories of nobility, each featuring a Latin title (and German translation) on the left, connected by a large vertical brace to a list of four specific titles, regions, or cities on the right.

Four Dukes. The four high Dukes.
{ Saxony, or Brunswick.
{ Bavaria, and others Austria.
{ Swabia, and others the Palatinate.
{ Lorraine, and others Burgundy.

Four Arch-Palatines. The four Counts Palatine.
{ The Rhine.
{ Saxony.
{ France.
{ Hungary.

Four Vicars, from the Reformation of Emperor Sigismund, book 2, chapter 20, section 2.
{ Austria.
{ Milan.
{ Savoy.
{ Burgundy.

Four Vicars, from the common Cologne Type.
{ Brabant.
{ Lower Saxony.
{ Westphalia.
{ Silesia.

Four Landgraves, that is, Provincial Counts.
{ Thuringia.
{ Alsace.
{ Hesse.
{ Leuchtenberg.

Four Margraves, that is, Frontier Counts.
{ Moravia.
{ Brandenburg.
{ Meissen.
{ Baden.

Four Burgraves, that is, Castle Counts.
{ Nuremberg.
{ Magdeburg.
{ Rheineck.
{ Stromberg.

Four Army Counts, or Military Counts, or more truly, War Leaders.
{ Brabant.
{ Normandy.
{ Hungary.
{ Ferrara.

Four Counts. The four simple Counts.
{ Cleves.
{ Savoy.
{ Schwarzburg.
{ Cilli, otherwise Greece or Gorizia.