Croats In Nestor’s “Primary Chronicle” -The most important and earliest major manuscript with information on Rus’ history and of the East Slavs is Nestor’s Primary Chronicle, written in the late 11th and early 12th centuries. It is a history of Kievan Rus’ from about 850 to 1110 and lists the twelve Slavic tribal unions who by the 9th century settled between the Baltic Sea and the Black Sea. These tribal unions were Polans, Drevlyans, Dregovichs, Radimichs, Vyatichs, Krivichs, Slovens, Dulebes (later known as Volhynians and Buzhans), White Croats, Severians, Ulichs, Tivertsi. Croats are also among the first five Slav people to be cited by their own names in Nestor’s “Primary Chronicle”.
Some of the north eastern Croats are mentioned as living near the Sozh river which lies within Russia, Belarus and Ukraine, as well as the Oka river which is near modern day Moscow. Remnants of Croats that did not migrate south to today’s Croatia circa. 6th and 7th centuries.
“Oleg Has His Shield Fixed to the Gates of Constantinople”. The early Russian prince Oleg around 907 took with him a multitude of soldiers, including Croats, and attacked Constantinople by land and by ship. After securing great wealth and trade agreements, he and his forces then returned back to Kiev. Croatians in effect also helped found the early Russian and Ukrainian states.
Croats/Horvati are listed as one of the twelve Slavic tribal unions who by the 9th century settled between the Baltic Sea and the Black Sea according to the Primary Chronicle.