Udayadityavarman II (Khmer: ឧទ័យាទិត្យវរ្ម័នទី២) built his state-temple the Baphuon Temple to honour the Hindu god Shiva, but some of the sculptures are dedicated to Buddha. He also completed the construction of the West Baray reservoir, started by his father Suryavarman I, and built the West Mebon Temple, a raised-earth island in its centre.
During his reign, several attempted rebellions, in 1051 and 1065, were crushed by his general Sangrama.
The Sdok Kak Thom temple, located near the present day Thai town of Aranyaprathet, was also constructed during his reign. The temple is perhaps most famous as the discovery site of a detailed inscription recounting the sequence of previous kings of Angkor. The inscription stele is now part of the collection of the national museum in Bangkok.