Red Ruthenia is a fancy word that describes a place that existed a long time ago in Eastern Europe. Think of it like a fairy tale land that people used to live in a really long time ago.
Some grown-ups like to talk about Red Ruthenia because it's an important part of history and it helps them understand where they came from. It's like when your mom and dad tell you stories about your grandparents and great-grandparents.
In Red Ruthenia, the people who lived there spoke different languages and believed in different things, but they all shared a love for their land and worked hard to make it a good place to live. They had kings and queens, castles and knights, and sometimes they went to war with each other.
Over time, Red Ruthenia became a part of different countries and its name was changed to different things. But people still remember it and talk about it, especially the grown-ups who are interested in learning more about their past.