Dato' Sir Onn bin Dato' Jaafar (; 12 February 1895 – 19 January 1962) was a Malayan politician who served as the 7th Menteri Besar of Johor from 1947 to 1950, then Malaya (now Malaysia). His organized opposition towards the creation of the Malayan Union (by the returning British colonial power after the end of the Japanese occupation of Malaya) led him to form the United Malays National Organisation (UMNO) in 1946; he was UMNO's founder and its first President until his resignation in 1951. He was famously known as the pioneer of organised anti-imperialism and early Malay nationalism within the entire Malaya, which eventually culminated with the Malayan independence from Britain. He was also responsible for the social and economic welfare of the Malays by setting up the Rural Industrial Development Authority (RIDA). His son is Hussein Onn, the third and former Prime Minister of Malaysia, his grandson is the current Minister of Defence, Hishammuddin Hussein, and his great-grandson is Onn Hafiz Ghazi, the current Member of the Johor State Legislative Assembly for Layang-Layang and 19th Menteri Besar of Johor. Early years Onn's father was Jaafar Muhammad, the former Chief Minister of Johor. His mother was Roquaiya Hanim (also spelled Rogayah Hanim or Rukiye Hanım; 1864–1904), who came from the Caucasus region of the Ottoman Empire (there are different hypotheses regarding her ethnicity). She was likely presented as a concubine (see Circassian beauties) by the Ottoman court to the sultan of Johor. His mother was married three times and the last time was with his father. As Onn Jaafar's family had close relations with the Johor palace, Sultan Ibrahim treated him as an adopted son. He started his education in a Malay school in Johor Bahru. In 1904, he went to England to attend Aldeburgh Lodge School, a private school in Suffolk, with the then Tunku Mahkota of Johor until 1910. He excelled in sports and captained the school's cricket and football teams. He returned to Malaya and was enrolled at the Malay College Kuala Kangsar (MCKK) where he studied there for two years from 1910 to 1911. According to biographer Ramlah Adam, one of the main reasons for him to enroll at MCKK was the need to improve his Malay language proficiency that had weakened considerably following his time in England. After graduating from MCKK, he worked as a trainee clerk at the Johor Government Secretary office and