Ramkhamhaeng (During 12th century)external image grand_palace_bangkok.jpg
Ramkhamhaeng is known as one of the greatest rulers of the Sukhotai period. Ramkhamhaeng organized a writing system which was used as the basis of writing, it soon developed into the modern Thai alphabet. Ramkhamhaeng ruled the Siamese at the point which is said to be the 'golden age' of the Siamese kingdom.

Taksin (1767 - 1781)
King Taksin was chosen to be king in the year 1767. Starting from Atthutaya Taksin moved South towards the Chao Praya River area where he started the Thonburi Period, Thonburi later became the capital of the Siamese Kingdom. Taksin was a very good king and attempted to revive culture, literature, and arts in Thonburi and was good for the Siamese until he got obsessed with power when he called himself a reincarnation of Buddha. The followers were furious at Taksin and were fed up. Taksin later died and his military advisor Chakri succeeded Taksin. Uniting the people of Siam and defeating the Burmese forces is Taksin's greatest achievement.
Rama I (1782 - 1809)
King Rama 1's official name was King Buddha Yodfa Chulalok. Rama 1 was Taksin's military advisor who continued to defend against the Burmese. Charkri moved the capital Thonburi to the present day capital Bangkok which was on the other side of the Chao Phraya River. To mark the founding of the new city, a shrine named Lak Muang was built.

Rama II (1809 - 1824)
Also known as King Buddha Loetla Nabhalai, King Rama 2nd was King Rama 1st's son. Rama II expanded the Thonburi empire and strengthend the empire. As well as preserving the Thai literature from the Ayutthaya period and produced new, classical literature. He also built and repaired many monasteries throughout Bangkok.

Rama IV (1851 - 1868)
Rama IV was the son of Rama II, he was also known as Vajirayana. Created laws the improved the rights of women and children. Many historians consider him as being one of the most important kings of the time. Rama IV opened new waterways, roads, created laws that improved the rights of women and children and created the first printing press.

Take note that all the rulers had kingship over their society. The kings had all the control, power, and judgment. However during the Ayutthaya period the Siam developed a hierarchy, but either way the supreme power were still held by the kings.

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Kings of Thailand. 8 Oct. 2006 <http://www.thaimain.org/eng/monarchy/

"Thailand - Government and History." Compton's Brittanica. T ed. 2005.

From Siam to Thailand - Kingdom brief history. 9 Oct. 2006

ChiangMai Citylife. 10 Oct. 2006 <http://www.chiangmainews.com/aboutchiangmai/