 During the reign of Sultan Bolkiah (1485–1521) the Kingdom of Brunei decided to break the Kingdom of Tondo's monopoly in the Chinese trade by attacking Tondo and establishing the city-state of Seludong as a Bruneian satellite.This is narrated through Tausūg and Malay royal histories, where the names Seludong, Saludong or Selurong are used to denote Manila prior to colonisation.Other sources said that the crafty, old sultanate had its basis of creation as a result of both political intrigue and economic maneuvering prompted by a sultan of Borneo named Bolkiah.