
The colors of the Margaviate of Meissen were black and gold. The colors were taken from the coat of arms, black eagle on gold. Medieval flags often have been scutcheon-flags, what means, that the image from the coat of arms was transfered on a flag.
Source: Volker Preuß


Coat of arms of the Margraviate of Meissen,
Source, by: Wikipedia (D)

The coat of arms of the Margraviate of Meissen showed a black lion on golden ground, and in this way the colours of the empire too.
Source:
Volker Preuß


Source:
Hand-Atlas für die Geschichte des Mittelalters und die neueren Zeit, 1880, modyfied by: Volker Preuß
The map shows the Margaviate of Meissen in the 13th century, within a red border.

965 · formation of the Margaviate of Meissen, as a fiefdom to the House of Wettin
1249 · elevation of the Margrave of Meissen (Heinrich the Illustrious) to the landgrave of Thuringia
1382 · "Chemnitz Partition" in three parts of land (Osterland, Thuringia, Meissen)
1423 · the Meissen Margrave Friedrich the Pugnacious got Saxony-Wittenberg (Electorate of Saxony) as fiefdom, pass of the name "Saxony" to the Margaviate of Meissen
Source: Volker Preuß

The name "Margaviate of Meissen" refers with "Margaviate" to the origin of the country as a Mark, a county at the border of the German Empire, and with "Meissen" to the residence and capital of the country.
Source: Volker Preuß

