Chronicles mention that Birutė was a priestess (Lithuanian: vaidilutė) and served the Pagan gods by guarding the sacred fire.

[16][15] In spite of the circumstances being unclear, one chronicle written by the Teutonic Knights briefly mentioned that Birutė was, for reasons of safety, moved to Brest, Belarus, where she was drowned in fall of 1382 (perhaps in response to Vytautas escape from Kreva).

In 1989 archaeologists found evidence of a pagan sanctuary and observatory, which had existed on the top of Birutė Hill in the late 14th or early 15th century.

To discourage people from worshiping pagan gods and Birutė's grave, a chapel for Saint George was built on the top of the hill in 1506.

In the 13th century, when the Teutonic Knights and Livonian Order invaded, the villagers built a defense system with a tower.

After an initial defeat, the system was rebuilt and made even stronger; it now had two towers and a wall surrounded the top of the hill.