High Quality Content by WIKIPEDIA articles! Wat Ong Teu Mahawihan (Temple of the Heavy Buddha) is one of many Buddhist Monasteries that are present in the city of Vientiane in Laos. This name is given to the temple due to the large, bronze Phra Ong Teu Buddha image that is present within the temple: the largest Buddha in Vientiane. This temple was initially constructed by King Settathirat I in the 16th century (known as the golden age of Buddhism in Laos) when Laos was being bombarded by the Burmese, but was later demolished during a foreign invasion. Thus, it may have gone through many reconstructions during the 19th or 20th century to attain the appearance it has today.