:Romania was a vassal or a tributary to Ottomans for about 189 years, but it was never annexed by any of those above! The Ottomans annexed Dobrogea, which is about 1/5 of Wallachia, the Austrians annexed Transylvania and Bukovine, and the Russians annexed half of Moldova, what they currently call "Republic of Moldova". Half of Moldova and almost the whole Wallachia were never annexed, I can prove it with scanned documents and maps (P.S. never trust Turkish maps, they'll show even Ukraine in the Ottoman empire).
During the 18th century, Wallachia was invaded by Austrian, Russian, Ottomans, with several forced change old leadership. Even if Wallachia was not officially annexed, end of 18th century and early 19th century were not a time when Romania was really independant.
That's why such list of "old countries" are hard to do, because how would you count such times?