Cordonia is a fictional European country in the Rules of Engagement and in the The Royal Romance series. It is ruled by King Constantine, and is the home of Queen Regina, European Guy and Prince "Liam". Cordonia's capital city is shown to have a large casino district, where the rich and famous, as well as top government officials, gather to gamble.
Cordonia is possibly a larger country than previously thought, as it is shown in The Royal Romance that it also has a mountainous northern region where it usually snows.
- Ryan Summers, Cassandra Leigh, and Alyssa Griffin, characters from Most Wanted, all make cameos there in Book 2, Chapter 11 of Rules of Engagement.
- Its gambling district seems to be based on Monte Carlo in Monaco.
- As a whole, Cordonia seems to be based on the Principality of Monaco, a real-life European country. This follows a trope in modern fiction of setting modern-day royal romances in tiny European countries that are easily overlooked, often based mostly on Monaco, the most famous real-life example.
- There is speculation in the fandom that Cordonia is possibly a modern-day Stormholt, from The Crown & The Flame series.