The Ly Dynasty was a ruling dynasty in Vietnam that lasted from 1009 to 1225. Founded by Ly Thai To, it marked a significant period in Vietnamese history, characterized by political stability and cultural development. The dynasty is known for establishing the capital in Thang Long, now known as Hanoi, and promoting Buddhism as a major religion. During the Ly Dynasty, Vietnam experienced advancements in agriculture, trade, and education. The dynasty also saw the creation of the first Vietnamese national history book, which helped to strengthen national identity. The Ly Dynasty is remembered for its contributions to Vietnamese culture and governance.