Dawn Fraser, AO, MBE, (born 4 September 1937) is an Australian champion swimmer. Known for her politically incorrect behaviour or larrikin character as much as her athletic ability, Fraser won eight Olympic medals, including four golds, and six Commonwealth Games gold medals. In October 1962 she became the first woman to swim the 100 metres in less than a minute. After she retired it was eight years before her record was broken.
In 1965 Fraser retired from swimming, after the Australian Swimming Union placed her under a 10 year ban.Read more at Wikipedia