This video covers the history of the German speaking minority in Transylvania (Siebenbürgen), from the 12th century until today. The region of Transylvania today is a part of Romania, but in the past it was also a part of Austria-Hungary, the Kingdom of Hungary and even it's own principality under the influence of the Ottoman Empire.

Sources (mostly):
https://unipub.uni-graz.at/obvugrhs/download/pdf/1952457?originalFilename=true
https://www.siebenbuerger.de/zeitung/artikel/verband/20258-wir-haben-einen-leidensvollen-weg.html#:~:text=Die%20Evakuierung%20verlangte%20bei%20ca,von%20etwa%2014.000%20Opfern%20ergeben.
https://de.wikipedia.org
Population censuses:
https://sas.unibuc.ro/storage/downloads/analize-regionale-9/AG48a.RECENSAMANT48.pdf
https://ia801600.us.archive.org/1/items/recensamntulgene02inst/recensamntulgene02inst.pdf

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