Brooke Bennett for the women and Ian Thorpe for the men. Ian was Australian and Brooke was American. Both competed in the 400 meter freestyle if that is the type of 400m you meant.
She attended 10 countries. OLYMPIC GAMES 1996 Atlanta/400m----------Silver Medal 2000 Sydney/400m----------Gold Medal WORLD CHAMPIONSHIPS 1995 Gothenburg/4x400m Relay----------Bronze Medal 1997 Athens/400m----------Gold Medal 1999 Seville/400m----------Gold Medal COMMONWEALTH GAMES 1990 Auckland/4x400m----------Gold Medal 1994 Victoria/4x100m----------Silver Medal 1994 Victoria/200m----------Gold Medal 1994 Victoria/400m----------Gold Medal 2002 Manchester/4x400m----------Gold Medal
Michael Johnson
It was his second Olympic gold medal in the 400m. He successful defeated his title.
The gold medal winner in the Women's 400m Event at the Rio 2016 Olympics was Shaunae Miller.
Her first Olympics was in the 1992 Olympics which were held in Barcelona, Spain. she competed in the 4x400m relay and the team came in at 7th place
Cathy Freeman did not set any world records in the Olympics. She is remembered for winning the gold medal in the women's 400m event at the 2000 Sydney Olympics.
Ian Thorpe broke the world record in the 400m freestyle at the 2000 Sydney Olympics, winning the gold medal in a time of 3:40.59.
The winner of the silver medal in the Women's 400m Hurdles event at the Rio 2016 Olympics was Sara Slott Petersen.
It is difficult to determine who would be the most famous aboriginal athlete in the world. Arguably, it may be Cathy Freeman, who gained the world's attention with her amazing gold medal win in the 400m sprint at the Sydney Olympics in 2000.
Cathy Freeman's 400m gold medal at the Sydney Olympics remains Australia's greatest sporting triumph, according to the nation's sporting heroes.
Otis Harris
Eric Liddell.