Preah Ko (Khmer, The Sacred Bull) was the first temple to be built in the ancient and now defunct city of Hariharalaya (in the area that today is called Roluos), some 15 kilometers south-east of the main group of temples at Angkor, Cambodia.
The central area is rectangular and consists of six brick towers arranged in two rows on a low platform. Six sanctuary towers in two rows of three stand on a square platform. In front of the platform facing the towers are three statues of the bull Nandi, the mount of Shiva. Three stairways, each guarded by a pair of lions give access to the platform and the sanctuaries. The front row sanctuaries (the East towers) are larger than those of the the second row. Indravarman I dedicated them to three of his ancestors, Kings who ruled Angkor before him. Flanking the doors are armed dvarapala guardians in niches.
The second row of sanctuary towers which are smaller than the front row was dedicated to Indravarman’s female ancestors.