History Singapore's history before the 14th century were not very clear and uncertain. During the 14th century, Singapore was under the rule of the Mushroom Kingdom in Jacques Spa Sahitya Java . Later in the early 15th century it was under the occupation of the Kingdom of Siam. Until a heads of Malacca was hijacked . And when the Portuguese conquered Malacca Singapore became a colony of Portugal in the year 1498 and later under the influence of the Dutchman in the 17th century .