Medievia is a MUD, an online text-based role-playing game. The game was initially created by Michael A. "Highlander" Smith, Anthony "Balor" Rowley, and Michael "Vryce" Krause in March 1992, using the Merc 1.00 MUD engine. The relationship between the Merc MUD codebase and Medievia's code is the subject of some controversy.
Read more about Medievia: Prominence, Business Model, Licensing and Status As A Derivative Work