Family tree of Thai monarchs

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The known history of the monarchy of Thailand begins with the founding of the Sukhothai Kingdom, inaugurated by Si Inthrathit in 1238. This was succeeded by the Ayutthaya Kingdom and the short-lived Thonburi Kingdom. The present reigning dynasty, the Chakri Dynasty, took the throne in 1782, founding the Rattanakosin Kingdom. The present-day constitutional monarchy was established in 1932. The Chakri kings are often known as Rama: the reigning monarch is King Rama X (Vajiralongkorn).