Uppsala was originally located a few kilometres north of its current location at a place now known as Gamla Uppsala (Old Uppsala). Today's Uppsala was then called "Östra Aros" (Eastern Aros, to differentiate it from Western Aros). (Old) Uppsala was, according to medieval writer Adam of Bremen, the main pagan centre of Sweden, and the Temple at Uppsala contained magnificent idols of the Norse gods. The Fyrisvellir plains along the river south of Old Uppsala, in the area where the modern city is situated today, was the site of the Battle of Fyrisvellir in the 980s.