, just south of
Kyiv, may have inspired the name "Lybid" for the woman who co-founded Kyiv. Many 20th-century Soviet historians considered Kyi and his rule circa the 6th century to be actual history. but he no longer mentioned Kyi and his siblings in his 2017 book
The Gates of Europe: A History of Ukraine, relegating them to the realm of legend, as little reliable information is known about Slavs in Ukraine prior to the 10th century. Roman Adrian Cybriwsky (2016) said "the founding story of Kyiv is dubious", and called Kyi "a person who may or may not have actually existed." The names of Kyi and his brothers have equivalents in an Armenian chronicle from the 7th century,
History of Taron, by
Zenob Glak. In it, Kyi and Khoryv have counterparts in brothers Kouar and Horian, while Polyans is paralleled in the Balounik district. An explanation for this can be found both in the common source (probably
Scythian) of Ukrainian and Armenian legends, and in the common mythological plot used to explain the founding of the many cows that inhabit the city. Paščenko related his name, beside to the Croatian ethnonym, also to the solar deity
Khors.
Lybid () is the name of another tributary of the Dnipro, just south of Kyiv. As a river,
Lybed () is mentioned twice in the
Primary Chronicle, first on page 69.8 during the Pecheneg
Siege of Kiev (968), and second on page 79.28–80.1 as the place where
Vladimir the Great settled his wife
Rogned' sub anno 980. In both cases, it takes the form of на Лыбеди (
na Lybedi, "at/on the Lybed'"). It is unknown whether the sister was named after the river or vice versa.
Byzantine sources report that the prince Kyi (originally Kuver) was brought up at the court of Emperor
Justinian I in his youth, converted to Christianity in
Constantinople, and was educated there. According to other Byzantine testimonies, Kyi was a contemporary of Emperor
Heraclius (575–641). As his contemporary John of Nicaea writes in detail, "by the power of the Holy and Life-Giving Baptism he received, he defeated all barbarians and pagans." The friendly ties of the ancient prince with the Byzantine imperial court is evidenced by the "Primary Chronicle". == Archaeological excavations ==