Old Prussian is a language that is no longer spoken. Synonyms for Old Prussian include Prussian, Jatvingian, Aukštaitian, Sudovian, and Galindian. It was primarily spoken in the region of Prussia, which includes parts of present-day Poland and Russia. Old Prussian had a large influence on Baltic languages such as Latvian and Lithuanian. However, much of the language has been lost over time, and very little is known about it today. Old Prussian is a significant part of Eastern European history and understanding it can provide insight into the cultural and linguistic evolution of this region.