When Siam restored law and order after the fall of Ayutthaya the monarch lived in Thonburi on the west side of the river. Rama I, on ascending the throne, moved the centre of administration to this side of the Chao Phraya; and, after erecting public monuments such as fortifications and monasteries, built a palace to serve not only as his residence but also his offices--the various ministries, only one of which remains in the palace walls.