The colours were taken from the colours of the Duchy of Brabant, and the vertical design may be based on the flag of France.
After the death of Charlemagne, the present-day territory of Belgium became part of Lotharingia, which had a flag of two horizontal red stripes separated by a white stripe. The territory then passed into Spanish hands, and after the coronation of Charles V, Holy Roman Emperor yellow and red, the colours of Spain, were added. From the 16th century to the end of the 18th century, the colours of Belgium were red, white and yellow.
On August 26, 1830, the day after the rioting at the Brussels Opera, and the start of the Belgian Revolution the flag of France was flown from the city hall of Brussels. This was hastily replaced by a tricolour of red, yellow and black horizontal stripes made at a nearby fabric store, similar to the one used during the Brabantian Revolution. As a result, article 193 of the Constitution of Belgium describes the colours of the Belgian Nation as Red, Yellow and Black instead of the order used in the above official flag.