[1] Udomdej studied at Saint Gabriel's College, an all-boys school.

[3] Sitabutr succeeded Prayuth Chan-ocha, who in May 2014, had seized power in a coup d'état.

[4] He concurrently served as Secretary-General of the junta, the National Council for Peace and Order.

[5][6] Udomdej retired in 2015 and was succeeded by Theerachai Nakvanich, with whom he had had a long-running feud.

Udomdej received the following royal decorations in the Honours System of Thailand: