The name 'Preah Ko' translates to 'Sacred Bull' in Khmer, named after the three Nandi statues found facing the central towers.
The temple was built to commemorate the king's parents, grandparents, and the royal ancestors who preceded him.
It is the earliest example of the 'temple-mountain' architectural style in the Angkor region.
The red brick structures were once coated in a lime mortar or stucco, which carried detailed relief carvings that are still visible in protected areas.
The temple's layout was designed to honor Shiva, with specific towers dedicated to both male and female ancestral figures.
It remains one of the most intact structures from the 9th-century Roluos group, having survived centuries of tropical weathering.
The site uses traditional Khmer post-and-lintel construction with sandstone door frames inset into brick masonry walls.
Preah Ko was the first temple constructed in the ancient city of Hariharalaya, the capital of the Khmer Empire before the move to Angkor. Built in 879 AD under King Indravarman I, the temple complex consists of six brick towers arranged in two rows, dedicated to Shiva and the king's royal ancestors. The site is notable for its well-preserved sandstone lintels and ornate stucco carvings that decorate the red brick walls. It is the initial temple of the Roluos Group, a cluster of monuments representing the beginning of classical Khmer art and architecture. Unlike the later massive Angkorian monuments, Preah Ko features a smaller, intimate layout. Visitors can observe the transition from primitive wooden construction to enduring stone masonry techniques typical of early Angkorian periods. The central towers are aligned east-west, reflecting Hindu cosmology and the orientation of the rising sun.
The front terrace, capturing all six towers in a single frame with the Nandi statues in the foreground.
Combine your visit with the nearby Bakong and Lolei temples to see the full evolution of the Roluos group.
Wear a hat and light clothing, as there is very little shade among the exposed brick towers.
Carry a high-quality camera lens to capture the fine details of the remaining stucco work on the upper levels of the towers.
Do not attempt to climb the towers or touch the fragile carvings, as the brick is prone to erosion and damage.
Shoulders and knees must be covered; remove hats when standing near the central shrines; do not touch or lean on the ancient brickwork.
