Sir Ranulph was fined £1,000 by magistrates Explorer Sir Ranulph Fiennes fell asleep at the wheel of his car and crashed into a vehicle on the opposite side of the road, a court has heard.
The explorer was injured in the head-on collision in Stockport, Greater Manchester, on 6 March.
The other motorist was in intensive care for a month with several injuries.
Sir Ranulph, 66, pleaded guilty to driving without due care and attention and was fined £1,000 at Stockport Magistrates’ Court.
He also received four penalty points on his licence.
His Jaguar collided with a Nissan Micra travelling in the opposite direction on the A6 in Heaviley, then a Ford Focus, before it mounted a pavement and came to a halt near the front window of an Italian restaurant at about 1400 BST on 6 March.
Sir Ranulph had competed in the 42-mile High Peak Marathon in Derbyshire the evening before the crash.
The explorer was the first man to visit both the North and South Poles by foot and the first to cross Antarctica on foot.
He also ran seven marathons on seven continents in seven days in 2003 and climbed the north face of the Eiger in 2007.
This article is from the BBC News website. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.