The Roluos Group – Birthplace of the Khmer Empire

The Roluos Group marks the earliest monumental expressions of the Khmer Empire, dating to the late 9th century under King Indravarman I and his successors. Located about 13–15 kilometers southeast of Siem Reap, these temples once formed part of Hariharalaya, the empire’s first capital before the shift to Angkor.

Though more modest in scale than Angkor Wat or Bayon, the Roluos temples embody the spiritual, architectural, and political foundations upon which the Khmer Empire would rise.

Preah Ko Temple (879 CE)

Preah Ko, or the “Sacred Bull” Temple, was founded by King Indravarman I as an ancestor temple dedicated to his forebears and their wives. By associating his lineage with the Hindu god Shiva, the king reinforced the divine legitimacy of his rule.

The temple consists of six elegant brick towers standing on a sandstone base, guarded by statues of Nandi, Shiva’s sacred bull. Its intimate layout and delicate carvings offer a vivid glimpse into the spiritual roots of Angkorian kingship and the importance of ancestor worship.

Bakong Temple (881 CE)

Bakong, the centerpiece of the Roluos Group, is the first great temple-mountain of the Khmer Empire. Representing Mount Meru, the cosmic axis of Hindu belief, Bakong was both a religious sanctuary and a political statement.

Built of sandstone and brick, its five-tiered pyramid, moats, and surrounding shrines signaled the dawn of classical Khmer architecture. Dedicated to Shiva through the enshrined lingam Sri Indresvara, Bakong proclaimed Indravarman I’s divine right to rule. Its design would go on to influence later masterpieces, including Angkor Wat.

Lolei Temple (893 CE)

Lolei was built by King Yasovarman I as the final temple of the Roluos Group. Dedicated to Shiva and the king’s ancestors, it originally stood on an artificial island at the center of a baray (reservoir), symbolizing the union of water, life, and divine kingship.

Although the baray has dried, the temple’s four brick towers still reflect this link between water symbolism and ancestor worship. Today, Lolei shares its space with an active Buddhist monastery, blending ancient stone with living religious practice.

Prei Monti Temple (9th century)

Prei Monti is the most modest of the Roluos temples, often overlooked by visitors. Believed to date from the reign of Jayavarman III or Indravarman I, it may even predate Preah Ko.

Though largely in ruins, the temple’s sandstone remains reveal the experimental stage of Khmer architecture, when builders first began moving beyond brick toward more durable materials. Its quiet rural setting offers a serene and contemplative atmosphere, evoking the empire’s earliest beginnings.

Cultural & Historical Significance

The Roluos Group represents Hariharalaya, the Khmer Empire’s earliest political and spiritual center, where the foundations of divine kingship were first expressed in stone. Preah Ko and Lolei emphasize ancestor worship, linking rulers to the gods through lineage. 

Bakong stands as the prototype for the temple-mountain form that would dominate Angkorian architecture for centuries. Prei Monti demonstrates early experimentation with sandstone, paving the way for the engineering marvels that followed.

Together, these temples form the origin story of Angkor, where ancestor veneration, cosmic symbolism, and architectural innovation converged to shape the Khmer Empire’s identity.