Wikipedia
Frygnowo (German Frögenau) is a village in the administrative district of Gmina Grunwald, within Ostróda County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately south of Ostróda and south-west of the regional capital Olsztyn. The village has a population of 1,000.
In 1914 the fields around the village were the main battlefield of the Battle of Tannenberg, which was eventually named after the nearby village of Tannenberg ( Stębark), whence the final victory note was dispatched by the German commanders.
Before 1945 the area was part of Germany ( East Prussia). After World War II the region was placed under Polish administration and ethnically cleansed according to the post-war Potsdam Agreement. The native German populace was expelled and replaced with Poles.