Third fascicle of Nithan Khun Borom (the Story of Khun Borom). The content tells the story of King Fan gum. When King Fa Ngum succeeded to the throne and ruled the kingdom of Lan Xang which was so-called Mueang Xiang Dong Xiang Thong (Luang Prabang), the king continued his plan on gathering the territories of the Tai people who were lineage of Khun Borom. The king of Nakhon Luang organized a marriage for King Fa Ngum and his daughter Princess Kaeo Kengya. Later, Queen Kaeo Kenya asked her husband to bring Buddhism in Lanka Vamsa to establish in Lan Xang kingdom. Then, the queen gave birth to two sons named Thao Un Huean and Thao Kham Kong.