appear to have known that Gleb and Vuzlev both represented Guðleifr, but instead kept them distinct. Later in the 12th c., in spite of the renown of the name Igor', the original Norse form Ingvar was borrowed again as a separate name, and it appears in the Hypatian Codex as the name of Ingvar Yaroslavich (d. 1212), and two princes of Ryazan. One of the latter was named Ingvar Igorevich, mentioned in 1207–1219, which shows that the two names were no longer connected. Consequently, Melnikova, considers that the 12th c. stands in stark contrast to the previous two centuries, showing that the Slavicization of the Rus elite would have been complete after the second half of the 11th c. On the other hand, the scholar Omeljan Pritsak considered that Old Norse must have been well known in Kiev and Novgorod, especially during the early decades of the 12th century. The linguist and literary theorist Roman Jakobson held a contrasting opinion, writing that Bojan, active at the court of Yaroslav the Wise, and some of whose poetry may be preserved in the epic poem The Tale of Igor's Campaign, or Slovo, in Old East Slavic, may have heard Scandinavian songs and conversations from visitors as late as 1110 (about the time his own work was done), and that even later, at the court of Mstislav (Haraldr), there must have been many opportunities to hear them. He cautions, however, that it cannot be presumed that Old Norse was still habitually spoken in 12th-century princely courts. Further, he says that Bojan's own life and career did not necessarily coincide with the time of the men whose lives he commemorated, and that he may have written of princes of an earlier period known to him only by report. Scholarly consensus holds as well that the author of the national epic, Slovo, writing in the late 12th century, was not composing in a milieu where there was still a flourishing school of poetry in the Old Norse language. Rural There are remains of Old Norse culture as late as the 14th and early 15th c. in the form of runic or rune-like inscriptions and as personal names. The c. 1000 birch-bark letters from Novgorod contain hundreds of names, most of them Slavic or Christian, and according to Melnikova there are seven letters with Old Norse names, but Sitzman identifies as many as 18, including Staraja