During the first year of his reign, he built about 100
monasteries (
ashrams) throughout his kingdom. Yasovarman was one of the great Angkorian kings. His greatest achievement was to move the capital from
Hariharalaya to
Yashodharapura where it remained there for 600 years. It was at this new capital where all of the great and famous religious
monuments were built, e.g. the
Angkor Wat. There were many reasons for the move. The old capital was crowded with temples built by the previous kings. Thus, the decision was
religious: In order for a new king to prosper, he must build his own temple and when he died it must become his
mausoleum . Second, the new capital was closer to the
Siem Reap River and is halfway between the
Kulen hills and the
Tonlé Sap. By moving the capital closer to the sources of water the king could reap many benefits provided by both rivers. Yashodharapura was built on a low hill called
Bakheng, and connected to Hariharalaya by a causeway. Simultaneously, he started to dig a huge reservoir at his new capital. This new artificial lake, the Yashodharatataka, or the
East Baray, with 7.5 by 1.8 km long dykes. The
Lolei,
Phnom Bakheng, and the
East Baray are monuments to this ruler, all located near
Cambodia's national treasure, a later construction,
Angkor Wat. Phnom Bakheng was one of three hilltop temples created in the
Khmer Empire’s
Angkor capital region during Yasovarman's reign, the other two being
Phnom Krom and
Phnom Bok. ==Posthumous name==