At the base of the mountain, is a step laterite staircase flanked by nagas.
[1] The 11th century temple was built by King Udayadityavarman II (Khmer: ឧតយាទិត្យវរ្ម័ន២) son of King Suryavarman I (Khmer: សូរ្យវរ្ម័នទី១) and despite some looting it is in a considerably better state of repair than Wat Ek Phnom.
[2] However, Udayadityavarman was Shaivite and the sculptures of Phnom Banan are mainly Buddhist.
As they were later on defaced like those in Angkor, it's highly likely that the Buddhist temple was the result of a temple rebuilding under Jayavarman VII in the late 12th century.
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