"Повесть временных лет" (The Tale of Bygone Years) is a historical chronicle written in the early 12th century. It is considered one of the most important sources of early East Slavic history, detailing the origins of the Rus' people and the formation of the Kievan Rus' state. The work combines historical facts, legends, and religious narratives, providing insight into the culture and society of the time. The chronicle was authored by Nestor, a monk from the Kyiv Monastery of the Caves. It covers events from the legendary founding of Kyiv in 482 to the year 1110. The text is notable for its rich storytelling and serves as a vital resource for understanding the early history of Ukraine, Belarus, and Russia.