After the murder of Alauddin Mansur Syah, Sultan Buyung was raised to the throne with the throne name Sultan Ali Ri'ayat Syah. The precise reasons why he was selected are not known to us, but there was apparently a lack of grown-up candidates. The old sultan left a young grandson, Raja Asyem, who may have been supported by part of the
orang kayas (grandees) but was too young to reign. Raja Asyem was protected by an old military of humble background, the later sultan
Alauddin Ri'ayat Syah Sayyid al-Mukammal who had allegedly murdered the boy's grandfather. Thus Aceh appears to have been politically divided during Sultan Buyung's brief reign. Of political events, we only know that the hostilities with the Portuguese in
Melaka ceased in his reign. Relations between the Portuguese and the leading Malay kingdom
Johor deteriorated after 1585 and the Johorese suffered a disastrous military defeat in 1587. As a consequence of this an Acehnese envoy appeared in
Melaka and a peace was concluded. The result of all this was that the sea-roads between the
Malay Peninsula and
Sumatra became free and trade expanded greatly. The peace held on for the next 19 years. Finally, the sultan was murdered under unclear circumstances on 28 June 1589 by "all the grandees" of the kingdom. Thus he was the fourth ruler in succession to be killed. The throne was now taken by Alauddin Ri'ayat Syah Sayyid al-Mukammal, who claimed descent from the 15th-century rulers of Aceh. His accession made an end to ten years of violent political infighting. ==References==