20th-century Thai monarchs

former King of Thailand (1927–2016)

Chulalongkorn (20 September 1853 – 23 October 1910), posthumously honoured as King Chulalongkorn the Great, was the fifth king of Siam from the Chakri dynasty, titled Rama V. Chulalongkorn's reign from 1868 until his death in 1910 was characterised by the modernisation of Siam, governmental and social reforms, and territorial concessions to the British and French empires. As Siam was surrounded by European colonies, Chulalongkorn, through his policies and acts, ensured the independence of Siam.

eighth monarch of Siam from the Chakri dynasty as Rama VIII

Prajadhipok, also known as Rama VII (8 November 1893 – 30 May 1941) was the seventh monarch of the Chakri dynasty and the last king of Siam under the absolute monarchy. He ascended the throne in 1925 and reigned until his abdication in 1935 during his self-imposed exile following his fallout with the new democratic government after the 1932 Siamese Revolution, which brought an end to the country’s absolute monarchy.

Vajiravudh (1 January 188126 November 1925) was the sixth king of Siam from the Chakri dynasty, titled Rama VI. He reigned from 1910 until his death in 1925. King Vajiravudh is best known for his efforts to create and promote Siamese nationalism. His reign was characterized by Siam's further Westernization, minimal participation in World War I, and lavish spending on arts and culture. He had keen interests in Siamese history, archaeology, and literature, as well as economics, politics and world affairs, and founded the country's first university, Chulalongkorn University.