Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Historic Centre of Vienna' has mentioned 'Empire' in the following places:
Occurrence Sentence Text Source
[citation needed] In 15 BC, the Romans fortified the frontier city they called Vindobona to guard the empire against Germanic tribes to the north.
Because of the industrialization and migration from other parts of the Empire, the population of Vienna increased sharply during its time as the capital of Austria-Hungary (1867xe2x80x931918).
[83] Companies in Vienna have extensive contacts and competences in business with Eastern Europe due to the city's historical role as center of the Habsburg Empire.
In 1683, Vienna became the capital of the Habsburg Empire and developed rapidly, becoming an impressive Baroque city.