I want to know the answer to the following question:
What empire included all of the Balkan Peninsula north to the southern edge of the Hungarian Plain at the beginning of the 19th century?
All the background I'm provided with is that "Up until 1912 the Ottomans retained a band of territory including Albania, Macedonia and Thrace, which were lost in the two Balkan Wars of 1912–13.". Is that enough to answer the question?