Angkor Wat

he 12th century was a time of conflict and brutal power struggles. Under Suryavarman II (reigned 1113–1150) the kingdom united internally^[7]:113 and the largest temple of Angkor was built in a period of 37 

years: Angkor Wat, dedicated to the god Vishnu. In the east, his campaigns against Champa, and Dai Viet, were unsuccessful,^[7]:114 though he did sack Vijaya in 1145 and depose Jaya Indravarman III.^[24]:75–76 The Khmers occupied Vijaya until 1149, when they were driven out by Jaya Harivarman I.^[4]:160 Suryavarman II sent a mission to the Chola dynasty of south India and presented a precious 

stone to the Chola Emperor Kulothunga Chola I in 1114.^[25][26]

Another period followed in which kings reigned briefly and were violently overthrown by their successors. Finally, in 1177 the capital was raided and looted in a naval battle on the Tonlé Sap lake by a Cham fleet under Jaya Indravarman IV, and Tribhuvanadityavarman was killed.^{[4]:164[24]:78}