Flags of the Holy Roman Empire
In 1804, Napoleon Bonaparte declared the First French Empire. In response to this, Emperor Francis II of the Habsburg dynasty declared his personal domain to be the Austrian Empire and became Francis I of Austria. Taking the colours of the banner of the Holy Roman Emperor, the flag of the Austrian Empire was black and gold. Francis II was the last Holy Roman Emperor, with Napoleon forcing the empire's dissolution in 1806. After this point, these colours continued to be used as the flag of Austria until 1918.
Duchy of Württemberg
The Duchy of Württemberg () was a duchy located in the south-western part of the Holy Roman Empire. It was a member of the Holy Roman Empire from 1495 to 1806. The dukedom's long survival for nearly four centuries was mainly due to its size, being larger than its immediate neighbors. During the Protestant Reformation, Württemberg faced great pressure from the Holy Roman Empire to remain a member. Württemberg resisted repeated French invasions in the 17th and 18th centuries. Württemberg was directly in the path of French and Austrian armies who were engaged in the long rivalry between the House of Bourbon and the House of Habsburg. In 1803, Napoleon raised the duchy to be the Electorate of Württemberg of the Holy Roman Empire. On 1 January 1806, the last Elector assumed the title of King of Württemberg. Later this year, on 6 August 1806, the last Emperor, Francis II, abolished (de facto) the Holy Roman Empire.