Toward the end of the 8th century CE, the Cambodian king Jayavarman II conquered vast territories near the great lake Tonle Sap.

[3][4]: 98  However, when he declared himself the universal monarch of the country in 802 CE, he did so not at Hariharalaya, but at Mahendraparvata on the Phnom Kulen Plateau.

Indravarman I also constructed the much smaller temple today called Preah Ko ("Sacred Bull"), dedicated in 880 CE.

In 889 CE, Indravarman I was succeeded by his son Yasovarman I, who constructed the temple of Lolei (the name may be a modern corruption of "Hariharalaya") on an artificial island in the middle of Indratataka.

[6] Yasovarman I also founded a new city at the site of Angkor Thom north of modern Siem Reap and called it Yaśodharapura.