be united. Arnulf continued to rule it like a king even after his submission, but after his death in 937 it was quickly brought under royal control by Henry's son Otto the Great. The Ottonians worked to preserve the duchies as offices of the crown, but by the reign of Henry IV the dukes had made them functionally hereditary. Emergence of "German" terminology Ottonians The eastern division of the Treaty of Verdun was called the regnum Francorum Orientalium or Francia Orientalis: the Kingdom of the Eastern Franks or simply East Francia. It was the eastern half of the old Merovingian regnum Austrasiorum. The "east Franks" (or Austrasians) themselves were the people of Franconia, which had been settled by Franks. The other peoples of East Francia were Saxons, Frisians, Thuringii, and the like, referred to as Teutonici (or Germans) and sometimes as Franks as ethnic identities changed over the course of the ninth century. An entry in the Annales Iuvavenses (or Salzburg Annals) for the year 919, roughly contemporary but surviving only in a twelfth-century copy, records that Baiuarii sponte se reddiderunt Arnolfo duci et regnare ei fecerunt in regno teutonicorum, i.e. that "Arnulf, Duke of the Bavarians, was elected to reign in the Kingdom of the Germans". Historians disagree on whether this text is what was written in the lost original; also on the wider issue whether the idea of the Kingdom as German, rather than Frankish, dates from the tenth or the eleventh century; but the idea of the kingdom as "German" is firmly established by the end of the eleventh century. In the tenth century, German writers already tended toward using modified terms such as "Francia and Saxony" or "land of the Teutons". Any firm distinction between the kingdoms of Eastern Francia and Germany is to some extent the product of later retrospection. It is impossible to base this distinction on primary sources, as Eastern Francia remains in use long after Kingdom of Germany comes into use. The 12th century imperial historian Otto von Freising reported that the election of Henry the Fowler was regarded as marking the beginning of the kingdom, though Otto himself disagreed with this. Thus: From this point some reckon a kingdom of the Germans as supplanting that of the Franks. Hence, they say that Pope Leo in the decrees of the popes, called Henry's son Otto the first king of the Germans. For