East of Siem Reap alongside National Highway No. 6 is the 9th century group of temples named for the close by town of Roluos. This group of ancient structures are what remains of Hariharalaya, the first significant capital of the Khmer Empire It was the Khmer capital for more than 70 years under four kings. The Roluos Group of temples comprises the temples of Prah Ko, Bakong, Lolei, plus a baray. These structures are fascinating and historic. This is particularly true of Bakong Temple, a five tiered pyramid shaped construction, which is in the best shape of the three temples. There are stone staircases balustraded with stone lions, leading up to the central sanctuary at the top. Yasovarman I, the last king to dwell at Hariharalaya, moved the capital to Angkor, and constructed Phnom Bakheng in 905 C.E Battambang Museum.