Prince of Smolensk is a title that has been used historically to refer to a powerful and influential ruler of the Principality of Smolensk. If you are looking for synonyms for this term, there are a number of possibilities to consider. Some of the most common alternatives include "ruler of Smolensk," "prince of the city of Smolensk," "lord of Smolensk," or simply "Smolenskian prince." Other options might include "master of Smolensk," "doyen of Smolensk," or "emperor of Smolensk," depending on the context in which the title is being used. Ultimately, the choice of synonym will depend on the tone, style, and purpose of your writing.