Following the death of his joint ruler and cousin, Sultan Abdul Jamil, Sultan Mansur became the sole ruler and assumed full control in 1512. Earlier in 1511, the city of Melaka was conquered by the Portugal, bringing the rule of Melaka Sultanate to an end, and so the Pahang status as a vassal. However, the Portuguese still recognise Pahang as a vassal, on the pretext that the city is now under their control, and demanded tribute. Sultan Mansur refused to pay the annual tribute, which resulted in open warfare between Pahang and the Portuguese.