Christiane Knacke
| Christiane Knacke in 1978 | |||||||||||||||||||||
| Personal information | |||||||||||||||||||||
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| Born | 17 April 1962 Berlin, Germany | ||||||||||||||||||||
| Height | 1.64 m (5 ft 5 in) | ||||||||||||||||||||
| Weight | 60 kg (130 lb) | ||||||||||||||||||||
| Sport | |||||||||||||||||||||
| Sport | Swimming | ||||||||||||||||||||
| Club | SC Dynamo Berlin | ||||||||||||||||||||
| Medal record 
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Christiane Knacke (later Driesener then Sommer, born 17 April 1962) is a retired swimmer from East Germany who specialized in the 100 m butterfly. In this event she won a silver medal at the 1977 European Aquatics Championships and a bronze medal at the 1980 Summer Olympics. She was the first woman to break the one-minute barrier in the event, when she clocked 59.78 on 28 August 1977, setting a new world record.
In 1989 she admitted to using performance-enhancing drugs against her will.
She married twice, changing her last name to Driesener and then to Sommer. Her daughter Jennifer was born in 1983.