That was the second of two sieges, the other being 1529, in which the Ottomans tried to take this seat of Hapsburg power.
In the run-up to World War II, this city was the location of a Nazi plot that assassinated Engelbert Dolfuss and put Kurt Schuschnigg in power. Polish king John Sobieski helped defend this city in 1683 in an event that allegedly led to the invention of the (*) croissant. That was the second of two sieges, the other being 1529, in which the Ottomans tried to take this seat of Hapsburg power. For 10 points, name this city which served as the site of an 1815 Congress that redrew the borders of post-Napoleonic Europe.
In the run-up to World War II, this city was the location of a Nazi plot that assassinated Engelbert Dolfuss and put Kurt Schuschnigg in power.
{Vienna} [or {Wien}; or {Viden}; or {Becs}]