In 1943 the Japanese beheaded Tengku Rachmadu ' llah , a member of the royal family of the Sultanate of Serdang . In the 1943 – 1944 Pontianak incidents ( also known as the Mandor Affair ) , the Japanese orchestrated a mass arrest of Malay elites and Arabs , Chinese , Javanese , Manadonese , Dayaks , Bugis , Bataks , Minangkabau , Dutch , Indians , and Eurasians in Kalimantan , including all of the Malay Sultans , accused them of plotting to overthrow Japanese rule , and then massacred them . The Japanese falsely claimed that all of those ethnic groups and organisations such as the Islamic Pemuda Muhammadijah were involved in a plot to overthrow the Japanese and create a " People 's Republic of West Borneo " ( Negara Rakyat Borneo Barat ) . The Japanese claimed that - " Sultans , Chinese , Indonesian government officials , Indians and Arabs , who had been antagonistic to each other , joined together to massacre Japanese . " , naming the Sultan of the Pontianak Sultanate as one of the " ringleaders " in the planned rebellion . Up to 25 aristocrats , relatives of the Sultan of Pontianak , and many other prominent individuals were named as participants in the plot by the Japanese and then executed at Mandor . The Sultans of Pontianak , Sambas , Ketapang , Soekadana , Simbang , Koeboe , Ngabang , Sanggau , Sekadau , Tajan , Singtan , and Mempawa were all executed by the Japanese , respectively , their names were Sjarif Mohamed Alkadri , Mohamad Ibrahim Tsafidedin , Goesti Saoenan , Tengkoe Idris , Goesti Mesir , Sjarif Saleh , Goesti Abdoel Hamid , Ade Mohamad Arif , Goesti Mohamad Kelip , Goesti Djapar , Raden Abdul Bahri Danoe Perdana , and Mohammed Ahoufiek . They are known as the " 12 Dokoh " . In Java , the Japanese jailed Syarif Abdul Hamid Alqadrie , the son of Sultan Syarif Mohamad Alkadrie ( Sjarif Mohamed Alkadri ) . Since he was in Java during the executions Hamid II was the only male in his family not killed , while the Japanese beheaded all 28 other male relatives of Pontianak Sultan Mohammed Alkadri . Among the 29 people of the Sultan of Pontianak 's family who were beheaded by the Japanese was the heir to the Pontianak throne . Later in 1944 , the Dayaks assassinated a Japanese man named Nakatani , who was involved in the incident and who was known for his cruelty . Sultan of Pontianak Mohamed Alkadri 's fourth son , Pengeran Agoen ( Pangeran Agung ) , and another son , Pengeran Adipati ( Pangeran Adipati ) , were both killed by the Japanese in the incident . The Japanese had beheaded both Pangeran Adipati and Pangeran Agung , in a public execution . The Japanese extermination of the Malay elite of Pontianak paved the way for a new Dayak elite to arise in its place . According to Mary F. Somers Heidhues , during May and June 1945 , some Japanese were killed in a rebellion by the Dayaks in Sanggau . According to Jamie S. Davidson , this rebellion , during which many Dayaks and Japanese were killed , occurred from April through August 1945 , and was called the " Majang Desa War " . The Pontianak Incidents , or Affairs , are divided into two Pontianak incidents by scholars , variously categorised according to mass killings and arrests , which occurred in several stages on different dates . The Pontianak incident negatively impacted the Chinese community in Kalimantan
Pontianak incidents
Pontianak incidents
Japanese occupation of the Dutch East Indies