No Prussian regiments had the House of Hannover emblem assigned to them, and there were no cavalry regiments based in Hanover. In 1290 Albert II gained the County of Brehna and in 1295 the County of Gommern for Saxony. Records of this event were not written until several years later, and sources are contradictory, depending on whom the author favoured. The Saxons devastated the Frankish stronghold at Eresburg; their leader (Herzog) Widukind refused to appear at the 777 diet at Paderborn, retired to Nordalbingia and afterwards led several uprisings against the occupants, avenged by Charlemagne at the (alleged) Massacre of Verden in 782. In 1152 Henry supported his cousin Frederick III of Swabia to be elected King of Germany (as Frederick I Barbarossa), probably being promised to regain the Duchy of Bavaria in exchange. Unwilling to give up without a fight, Henry already had dealt the first blow in 1180 against the city of Goslar, which he had coveted for several years already. The Duchy of Saxony (Low German: Hartogdom Sassen, German: Herzogtum Sachsen) was originally the area settled by the Saxons in the late Early Middle Ages, when they were subdued by Charlemagne during the Saxon Wars from 772 and incorporated into the Carolingian Empire by 804.Upon the 843 Treaty of Verdun, Saxony was one of the five German stem duchies of East … Ida of Herzfeld may have been an ancestor of the Saxon count Liudolf (d. 866), who married Oda of Billung and ruled over a large territory along the Leine river in Eastphalia, where he and Bishop Altfrid of Hildesheim founded Gandersheim Abbey in 852. It originally was a frontier march of the Holy Roman Empire, created out of the vast Marca Geronis in 965. As the Carolingian Empire declined in the late 9th century, the old tribal areas assumed new identities as subdivisions of the realm. Henry's dominion now covered more than two thirds of Germany from the Alps to the North Sea and the Baltic Sea, making him one of the mightiest ruler in central Europe, and thus also a potential threat for other German princes and even Barbarossa. The ancient stem duchy of Saxony was partitioned in some dozens of territories of imperial immediacy by Barbarossa, and ceased to exist. In 772 Pepin's son Charlemagne started the final conquest of the Saxon lands. Records of this event were not written until several years later, and sources are contradictory, depending on whom the author favoured. Henry the Proud, a member of the House of Welf, was Duke of Bavaria from 1126 to 1138 and Duke of Saxony as well as Margrave of Tuscany and Duke of Spoleto from 1137 until his death. In 1168, Henry married Matilda Plantagenêt, the daughter of Henry II of England and Eleanor of Aquitaine and sister of Richard Lionheart. These are the five stem duchies : Bavaria, Franconia, Lotharingia (Lorraine), Saxony and Swabia (Alemannia). The following list includes states that existed in the territory of the former stem duchy in addition to the two legal successors of the stem duchy, the Ascanian Duchy of Saxony formed in 1296 centered around Wittenberg and Lauenburg, as well as the Duchy of Westphalia, held by the Archbishops of Cologne, that already split off in 1180. His position was strong enough to wed Hedwiga of Babenberg, daughter of mighty Duke Henry of Franconia, princeps militiae of King Charles the Fat. Henry I, a member of the House of Ascania, was Count of Anhalt from 1212 and the first ruling Anhalt prince from 1218 until his death. In 1288 Albert II applied at King Rudolph I for the enfeoffment of his son and heir Duke Rudolph I with the Palatinate of Saxony, which ensued a long lasting dispute with the eager clan of the House of Wettin. Henry was able to integrate the Swabian, Bavarian and Lotharingian duchies into the imperial federation, vital to handle the continuous attacks by Hungarian forces, whereby the Saxon troops about 928/929 occupied large territories in the east settled by Polabian Slavs. In the east, the Ascanians, the Welf's old rivals, finally gained a, severely belittled, Duchy of Saxony, occupying only the easternmost, comparably small territories along the river Elbe around Lauenburg upon Elbe and around Wittenberg upon Elbe.