Searching wallachia and the troubles results in a wiki article about the night attack at Târgoviște. Probably not what they were talking about but it's interesting so I'll pretend that it is.
Hello! Is Miss Scarlet in?Long time no see, Miss Remilia! It's been decades since you left after the troubles!Are you sister's friend? Flan will call for her.She will, as a matter of fact. It's a good thing that a reliable youkai like Meiling has come to us. Magicians and other vampires don't consider us very highly, and we can't trust humans either, so I'll be relieved to have someone like Meiling on our side."Sister"? So you're Remilia's little sister?She's a very adorable young lady, your sister! A shame we didn't get to meet in Wallachia.Flan, this is Hong Meiling. She came from the East, further than the Ottoman Empire.Indeed! I was fortunate to become acquaintance with Miss Remilia when I was traveling the Silkroad with a merchant.That's incredible! Are you going to live with us too, Miss Meiling?Meiling! I'm so glad to see you again! This is my sister, Flandre.
