[1] On 9 May 1948, Amborn was ordained as a full bhikkhu, with the Dhamma name of Ambaro, in the Dhammayuttika Nikaya at Wat Ratchabophit in Bangkok, with Vasana Vāsano as his preceptor.

[2] Ambaro was a student of the highly revered monk Phra Ajahn Fan Ācāro [th] a Vipassanā master and the former abbot of Wat Pa Udom Somphon in Sakon Nakhon province.

[1] In 2009, Ambaro was appointed abbot of Wat Ratchabophit, a royal temple of the first class, built in 1869 by King Chulalongkorn, where he has lived since 1948.

On 5 December 2009, Ambaro was created the 2nd Somdet Phra Maha Muniwong (Thai: สมเด็จพระมหามุนีวงศ์) by King Bhumibol Adulyadej.

[1][3] On 7 February 2017, Prime Minister Prayut Chan-o-cha confirmed the appointment of Somdet Phra Maha Muniwong as the 20th Supreme Patriarch of Thailand in a televised address.