Even though some historians, such as
Przemysław Urbańczyk, claim that the Vistulans did not exist, there are three documents from the 9th century which can be tied to this tribe. First is the so-called
Vita Methodii or
Pannonian Legend (The Life of
St. Methodius), second is the
Bavarian Geographer, and third is
Alfred the Great's
Germania. A verse in Old English poem
Widsith (10th century): It is considered that parts of the epic poem could be dated to the 6th century. The syntagma
ymb Wistlawudu has seen different translations by the scholars depending on the consideration whether
Wistla is a borrowing from a German, Latin, or Slavic language. As such
*Wīstle could be identified with the people, while
Wistlawudu interpreted as "by the Vistulan woods" or "by the Vistulan wooden hills" (
Beskids and
Western Carpathians). However, the Hræda which is genitive plural of
*Hraede, gives further insight to the meaning and age of the poem. Although it is usually related with the
Goths from the same poem (
Hred-Gotum,
Hreth-Gotan,
Hreidhgotar), but other scholars disagree.
Leontii Voitovych believed that the Vistulans were the main tribe among those Silesian and Lechitic tribes who invaded this territory, dividing the Croatian lands into Eastern and Western parts. Based on
Lubor Niederle's thesis that the Vistulans are remnants of the once strong alliance of Croatian tribes which fell apart after the migration of the Croats to the Western Balkans in the 7th century,
Tadeusz Lehr-Spławiński additionally noted that the name Vistulans was only known among Western Slavs and Germans, while in the East, in Byzantine and Arabian sources, the older name of Croats was retained for the same territory. Such an interpretation of the reference to
ymb Wistlawudu ("in the Vistula woods") in the Anglo-Saxon poem
Widsith argues that instead of 5th century events, the poem instead intended to refer to 6th century events contemporaneous with the
Lombard king
Alboin , when the
Pannonian Avars led by
Bayan I (''Attila's people'') expanded between 568 and 595 into the
Pannonian Basin and extended their influence northward on the Slavs (Vistulans, Croats) in the Upper Vistula valley, seen in Avarian archaeological remains up to
Gniezno in central-western Poland. ==History==