text: Three statues of sacred oxen are located at a site in this empire's Roluos group of monuments.
full_question: Three statues of sacred oxen are located at a site in this empire's Roluos group of monuments. The people of this empire believed that its king spent every night with a nine-headed snake woman in a golden tower, according to Zhou Daguan's account of this empire. Raids on this kingdom by the Champas damaged its irrigation network, which used water tanks called (*) barays. This empire was preceded by the Funan Kingdom and the Chenla Kingdom. This empire was home to a site featuring many giant statues of smiling heads, Bayon. Several kings named Jayavarman and Suryavarman ruled this empire, which also built a massive temple complex designed to look like Mount Meru. For 10 points, name this Cambodian empire which built Angkor Wat.
first_sentence: Three statues of sacred oxen are located at a site in this empire's Roluos group of monuments.
raw_answer: Khmer Empire [or Angkor Empire until "Angkor" is read; prompt on Kampuchea or Cambodia]