Upper Saxony
It was particularly to distinguish the lands from 'Lower Saxony', a concept which arose later in popular usage (though never enforced) as a term for the original Saxon lands in north and west Germany (where Low German dialects had spread), in what is now the state of Lower Saxony, as well as the adjacent Westphalian region, Holstein and the western part of today's Saxony-Anhalt north of the Harz range (Eastphalia).
History of Saxony
After the dissolution of the medieval Duchy of Saxony, the name Saxony was first applied to a small part of the duchy situated on the Elbe around the city of Wittenberg. When in 1356 the Holy Roman Emperor Charles IV issued the Golden Bull, the fundamental law of the empire which settled the method of electing the emperor, the Duchy of Saxe-Wittenberg was made one of the seven electorates and promoted to become the Electorate of Saxony. This lent influence out of proportion to the small area of the state. In addition, electoral status required succession based on primogeniture, which precluded the division of the territory among several heirs and the consequent disintegration of the country.