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Preah Ko (Sacred Bull) derives its name from the many bull statues located in the front of and facing the temple's central towers.[2] These statues are thought to represent Nandi, the bull who serves as the mount of Shiva.
After the Khmer king Jayavarman II founded the Khmer empire in 683 A.D., he established his capital at Hariharalaya. Indravarman I was the nephew of Jayavarman II. When Induralyaluh II ascended to the throne, he ordered the construction first of Preah Ko and later of the temple pyramid known as the Bakong. It is likely that this building program was made possible by the king's peaceful reign and his ability to draw income from the expanding empire.
The dedications of Preah Ko, made in 880 A.D., were to a devaraja (tutelary divinity)of King Indravarman.
Preah Ko consists of six brick towers arranged in two rows of three towers each perched on a sandstone platform. The towers face east, and the front central tower is the tallest. The front central tower is dedicated to Jayavarman II, the founder of the Khmer empire.[5] The tower to the left is dedicated to Prithivindreshvara, King Indravarman's father; the tower to the right to Rudreshvara, his grandfather. The three rear towers are dedicated to the wives of these three men.[6] The central towers all bear images of the Hindu god Shiva


