How far back do you want to go? Vienna history can reach back to the first century AD, when the Romans called city "Vindobona." The city gradually became a center of commerce. Charlemagne came in and conquered what is now Austria, then called Ostmark, during the Avar Wars (791-796). Cut through the Battle of Lechfeld and the Babenberg rule to 1278: the Habsburg dynasty was established with the ascension of Rudolf I. Development of universities and cultural amenities, as well as several wars, followed. Vienna became the seat of the emperor in 1556. Railways were built, Ringstrasse was built, and badabing-badaboom, Vienna sells Mozart balls. What?