In the 19th century, Terengganu became a vassal state of the Thai Rattanakosin Kingdom, and sent tribute every year called bunga mas. This occurred under the reign of Sultan Omar Riayat Shah, who was remembered as a devout ruler who promoted trade and stable government. Under Thai rule, Terengganu prospered, and was largely left alone by the authorities in Bangkok.[1] The period also witnessed the existence of a Terengganuan vassal of Besut Darul Iman.