some other Germanic tribes such as the Cugerni were later settled on the west side of the Rhine in the Roman province of Germania Inferior. Julius Caesar conquered the tribes on the left bank, and Augustus established numerous fortified posts on the Rhine, but the Romans never succeeded in gaining a firm footing on the right bank, where the Sugambri neighboured several other tribes including the Tencteri and Usipetes. North of the Sigambri and the Rhine region were the Bructeri. As the power of the Roman empire declined, many of these tribes came to be seen collectively as Ripuarian Franks and they pushed forward along both banks of the Rhine, and by the end of the fifth century had conquered all the lands that had formerly been under Roman influence. By the eighth century, the Frankish dominion was firmly established in western Germany and northern Gaul, but at the same time, to the north, Westphalia was being taken over by Saxons pushing south. The Merovingian and Carolingian Franks eventually built an empire which controlled first their Ripuarian kin, and then the Saxons. On the division of the Carolingian Empire at the Treaty of Verdun, the part of the province to the east of the river fell to East Francia, while that to the west remained with the kingdom of Lotharingia. By the time of Otto I (d. 973), both banks of the Rhine had become part of the Holy Roman Empire, and the Rhenish territory was divided between the duchies of Upper Lorraine on the Moselle and Lower Lorraine on the Meuse. The Ottonian dynasty had both Saxon and Frankish ancestry. As the central power of the Holy Roman Emperor weakened, the Rhineland split into numerous small, independent, separate vicissitudes and special chronicles. The old Lotharingian divisions became obsolete, although the name survives for example in Lorraine in France, and throughout the Middle Ages and even into modern times, the nobility of these areas often sought to preserve the idea of a preeminent duke within Lotharingia, something claimed by the Dukes of Limburg, and the Dukes of Brabant. Such struggles as the War of the Limburg Succession therefore continued to create military and political links between what is now Rhineland-Westphalia and neighbouring Belgium and the Netherlands. In spite of its dismembered condition and the sufferings it underwent at the hands of its French neighbours in various periods of warfare, the