original_query: What is the legend of Preah Ko Preah Keo about?
query: What is the legend of Preah Ko Preah Keo about?
answer: The legend of Preah Ko Preah Keo is a Cambodian story about two brothers, Preah Ko (a sacred ox) and Preah Keo (a sacred gem), who possess divine powers and bring peace and prosperity.  The legend often involves conflicts with the Siamese (Thai) and the loss and recovery of sacred Khmer treasures.