Gamla Uppsala, the old Uppsala: until the 13th century Uppsala was an important center and a few km further north; but Östra Aros in the south grew more important at that time, and as after a fire, the new cathedral was planned to be built there, the pope requested that it should be renamed Uppsala. At the old location, there is still the church (the wall paintings are from the 15th century), a museum and the royal mounds, three large tumuli where, according to mythology, Thor, Odin and Freyr are lying …. (free from Wikipedia)