Bangkok period
Rama I

Rama I restored most of the social and political system of the Ayutthaya kingdom, promulgating new law codes, reinstating court ceremonies and imposing discipline on the Buddhist monkhood. His government was carried out by six great ministries headed by royal princes. Four of these administered particular territories: the Kalahom the south; the Mahatthai the north and east; the Phrakhlang the area immediately south of the capital; and the Krommueang the area around Bangkok. The other two were the ministry of lands (Krom Na) and the ministry of the royal court (Krom Wang). The army was controlled by the King's deputy and brother, the Uparat. The Burmese, seeing the disorder accompanying the overthrow of Taksin, invaded Siam again in 1785. Rama allowed them to occupy both the north and the south, but the Uparat led the Siamese army into western Siam and defeated the Burmese in a battle near Kanchanaburi. This was the last major Burmese invasion of Siam, although as late as 1802 Burmese forces had to be driven out of Lanna. In 1792 the Siamese occupied Luang Prabang and brought most of Laos under indirect Siamese rule. Cambodia was also effectively ruled by Siam. By the time of his death in 1809 Rama I had created a Siamese Empire dominating an area considerably larger than modern Thailand.