Old Saxony is the original homeland of the Saxons in the northwest corner of modern Germany and roughly corresponds today to the modern German state of Lower Saxony, Westphalia and western Saxony-Anhalt.Adam of Bremen, writing in the 11th century, compared the shape of Old Saxony to a triangle, and estimated from angle to angle the distance was eight days journey. In area Old Saxony was the greatest of the German tribal duchies.