Ever since this event Alsace has occupied the European historical stage as a bone of contention between German-speaking peoples and their rivals of French speech. A year had hardly elapsed after this exchange of pledges, when the division of the Frankish Empire between the grandsons of Charles the Great was formally settled by the treaty of Verdun. Lothaire, the eldest brother, was awarded Alsace and Lorraine. From this time on, Alsace became a part of the lands of German speech which form a compact block in central Europe. In 1469, however, Sigismund of Austria mortgaged his land holdings in Upper Alsace to Charles of Burgundy who thereby assumed jurisdiction over the districts affected by the mortgage. The treaty of St. Omer which contains the terms of this transaction paved the way for subsequent French intervention in both Alsace and Lorraine. Accordingly, a few years later, by the treaty of Nancy (1473), Charles of Burgundy was recognized by René II of Lorraine as the “protector” of Lorraine. It was only in the seventeenth century, however, that France obtained a definite foothold in Alsace and Lorraine. In 1648, the country won by treaty settlement her long contested rights in Alsace. The treaties of Nimwegen (1679) and Ryswick (1697) confirmed Louis XIV in his possession of the major portion of Alsace. By that time French influence had acquired a paramount share in both of the border provinces. Lorraine, however, was not formally ceded to France until the treaty of Vienna was signed in 1738. French sovereignty over Alsace was confirmed again by the treaty of Lunéville, in 1801, and by the Congress of Vienna in 1815. It was to last until 1871. In that year Alsace and Lorraine became part of the newly constituted German Empire, the cession being determined by Arts. I to IV of the treaty of Frankfort. The preceding paragraphs show that the earliest form of French and German nationality assumed shape immediately after the treaty of Verdun and at about the time when the language spoken in these countries began to present similarity to the forms used at present. In the partition of Charlemagne’s empire only two of the three divisions were to survive. The western evolved finally into modern France. The easternmost became Germany. Lying between the two, Lothringia naturally became the coveted morsel which crumbled to pieces in the struggle waged for its possession.