The EU's visible center of gravity sits in the old middle belt between France and Germany: Low Countries, Luxembourg, Lorraine, Rhineland, Alsace, upper Rhine. The map makes the point by laying the medieval Lotharingian/Burgundian corridor under the postwar EU's seats, founders, treaty sites, and family/background places.
Call it Burgundian Bourgeois if you mean the modern administrative-commercial habit. Call it Lotharingian if you mean the older borderland geography that kept being fought over and then bureaucratically reconciled.
The colored areas are intentionally schematic. The claim is visual center of gravity, not exact medieval border reconstruction.
The EU does not look like a Paris project, a Berlin project, or a revived Roman imperial project when you plot its working capitals. Its administrative core is Brussels-Luxembourg-Strasbourg-Frankfurt, which is almost exactly the old western middle zone: Low Countries, Lorraine, Rhineland, Alsace, upper Rhine.
The founding personalities strengthen that read. Schuman is Luxembourg/Lorraine in one body. Adenauer is Catholic Cologne/Rhineland. Bech is Luxembourg. Spaak is Brussels/Benelux. Beyen is Dutch banking/common-market logic. Hallstein is Mainz/Rhine legalism. Monnet and Spinelli matter enormously, but on this map they look like outside engines feeding the corridor rather than the corridor itself.
So the best precise formula is: not "descended from Burgundian dukes," but a postwar institutional class growing out of the old Burgundian-Lotharingian problem space: multilingual cities, borderland law, Catholic social politics, merchant-bureaucratic compromise, and fear of Franco-German war.