 However Sultan Dziaddin was forced to abdicate in 1803 by the King of Siam and was replaced by his nephew Sultan Ahmad Tajuddin II.This sparked a succession crisis as crown prince, Tunku Bisnu claimed to be the rightful heir to the throne.Fearing civil war, the Siamese Kingdom reconciled the two parties by appointing Tunku Bisnu as ruler of Setul, thus establishing the Kingdom of Setul Mambang Segara in 1808.