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.
Battle of Pollentia
Theodosius I, the last emperor of both eastern and western halves of the Roman Empire, died in 395, leaving his sons Arcadius and Honorius emperors of the East and West, respectively. However, the weakness of character of the two brothers, and their young age upon their accession to the throne, made it possible for ambitious and sometimes unscrupulous ministers to assume the effective rule of the Empire.