Before the 13th century, the territory was inhabited by Old (Baltic) Prussians, a Baltic ethnic group that lived in Prussia (the area of the southeastern coastal region of the Baltic Sea neighbouring of the Baltic Sea around the Vistula Lagoon and the Curonian Lagoon). A part of the territory later called Masuria was then known as Galindia and was probably a peripheral, deeply forested and lightly populated area. Inhabitants of the now Masuria spoke a language now known as Old Prussian and had their own mythology. Although a 19th-century German political entity bore their name, they were not Germans. They were converted to Roman Catholicism in the 13th century, after conquest by the Knights of the Teutonic Order.
Before the 13th century the territory was inhabited by Old (Baltic) Prussians a Baltic ethnic group that lived in Prussia (the area of the southeastern coastal region of the Baltic Sea neighbouring of the Baltic Sea around the Vistula Lagoon and the Curonian Lagoon) A part of the territory later called Masuria was then known as Galindia and was probably a peripheral deeply forested and lightly populated area Inhabitants of the now Masuria spoke a language now known as Old Prussian and had their own mythology Although a 19th-century German political entity bore their name they were not Germans They were converted to Roman Catholicism in the 13th century after conquest by the Knights of the Teutonic Order