Samguk Yusa is a historical text from Korea, written in the 13th century by the monk Iryeon. It chronicles the history of the three ancient kingdoms of Korea: Goguryeo, Baekje, and Silla, along with various legends, myths, and folklore associated with these kingdoms. The title translates to "Memorabilia of the Three Kingdoms," and it serves as an important source for understanding early Korean history and culture. The text includes stories about notable figures, such as King Dongmyeong, the founder of Goguryeo, and explores the spiritual and cultural beliefs of the time.