The Austrian Flag of the Habsburg Monarchy with yellow and black bars (The original form of this flag featured a yellow background with a black double-headed eagle) was approved for use as a civil flag at the end of the Holy Roman Empire in 1804.
The original form of this flag featured a yellow background with a black double-headed eagle. In the 18th century, the simpler form with the yellow and black bars started to appear in the Habsburg Monarchy. With the end of the Holy Roman Empire in 1804, this flag was approved for use as a civil flag. However, the black-yellow flag was used as the national flag (in a modern sense) of the Austrian Habsburg Monarchy, the later Austrian Empire and the Austrian part of Austria-Hungary, sometimes even for the entire empire as well, until 1918. 
