Prajadhipok (ประชาธิปก, RTGS: Prachathipok, 8 November 1893 – 30 May 1941), also Rama VII, was the seventh monarch of Siam of the Chakri dynasty. His reign was a turbulent time for Siam due to political and social changes during the Revolution of 1932. He is to date the only Siamese monarch of the Chakri Dynasty to abdicate.
Somdet Chaofa Prajadhipok Sakdidej (สมเด็จเจ้าฟ้าประชาธิปกศักดิเดชน์) was born on 8 November 1893 in Bangkok, Siam (now Thailand) to King Chulalongkorn and Queen Saovabha Phongsri. Prince Prajadhipok was the youngest of nine children born to the couple. Overall he was the king's second-youngest child (of a total of 77), and the 33rd and youngest of Chulalongkorn's sons.
Unlikely to succeed to the throne, Prince Prajadhipok chose to pursue a military career. Like many of the king's children, he was sent abroad to study, going to Eton College in 1906, then to the Woolwich Military Academy from which he graduated in 1913. He received a commission in the Royal Horse Artillery in the British Army based in Aldershot. In 1910 Chulalongkorn died and was succeeded by Prajadhipok's older brother (also a son of Queen Saovabha), Crown Prince Vajiravudh, who became King Rama VI. Prince Prajadhipok was by then commissioned in both the British Army and the Royal Siamese Army. With the outbreak of the First World War and the declaration of Siamese neutrality, King Vajiravudh ordered his younger brother to resign his British commission and return to Siam immediately, a great embarrassment to the prince, who wanted to serve with his men on the Western front. Once home, Prajadhipok became a high-ranking military official in Siam. In 1917 he was ordained temporarily as a monk, as was customary for most Buddhist Siamese men.
In August 1918 Prince Prajadhipok married his childhood friend and cousin Rambhai Barni, a descendant of King Mongkut (Prajadhipok's grandfather) and his Royal Consort Piam. They were married at Sukhothai Palace which was a wedding gift to the couple from Queen Saovabha.