Flag of the Habsburg Monarchy
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| Use | Civil flag and ensign |
|---|---|
| Proportion | 2:3 |
| Adopted | 18th century |
| Design | A horizontal bicolour of black and yellow. |
Since the days of Rudolph of Habsburg and the 1283 Treaty of Rheinfelden, the combination of red-white-red was widely considered to be the Austrian (later also Inner Austrian) colours used by the ruling Habsburg dynasty. However, the national flag (in a modern sense) of the Austrian Habsburg Monarchy, like the later Austrian Empire and the Cisleithanian part of Austria-Hungary until 1918, was black-yellow. These were the family colours of the Imperial House of Habsburg, and were themselves in part derived from the banner of the Holy Roman Empire.
Beginning in the reign of Emperor Joseph II, the Austrian, later Austro-Hungarian Navy used a Naval Ensign (Marineflagge) based on the red-white-red colours, and augmented with a shield of similar colours. Both of these flags became obsolete with Austria-Hungary's dissolution in 1918, and the newly formed rump state of German Austria adopted the red-white-red triband as its national flag.
Today, the flag is similar to the flags of Munich, Germany and Namur, Belgium.
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