The other day, someone mentioned that large chunks of French dialogue appear in War and Peace without any translation into Russian. In the 19th century, when the novel was written, knowledge of French was widespread among the Russian aristocracy and they tended to speak French to each other. So they would have been able to follow the French in the book without difficulty.
This got me thinking whether there are many other bilingual novels. In regions where two or more languages are a part of everyday live, you’d think that some writers might use a mixture of those languages in their stories. However, apart from a few Welsh and Irish novels which include bits of English dialogue, I haven’t come across any bilingual novels. Have you?