The Brownlee brothers produced Yorkshire's first one-two at the Olympic Games as Alistair defied the searing hear to beat younger brother Jonny to gold for a the second time.
Alistair became the first triathlete in the sport's 16-year Olympic history to successfully defend gold after pulling clear of his brother in the final 5km.
He picked up British and Yorkshire flags 100 metres or so from the finish and sauntered down the finishing straight, at one point stopping and holding his arms aloft before crossing the line.
Jonny upgraded the bronze he won in London four years ago as he held off the attentions of South African bronze medallist Henri Schoeman to win silver - finishing six seconds behind his brother.
Yorkshire has now won 11 medals at the Rio Games including four golds.
Alistair joins Ed Clancy and Andrew Triggs Hodge in winning successive Olympic gold medals.
Alistair was a hot favourite to win gold in Copacabana and showed his class in front of waves of supporters, including many from Great Britain.
The Brownlees were at the front of the field throughout the Olympic distance race and moved clear of the field on the 10km run.
However, fellow Leeds athlete Gordon Benson's hopes came to a painful end after he was forced to retire following a crash on the cycle leg.
The heat of the race took its toll as the riders came off their bikes for the final transition and Alistair called for water supplies within the opening kilometre of the run.
At that point, 26-year-old brother Jonny led a pack of three at the front with Vincent Luis trying to keep up with the pace.
However, the Frenchman was was soon dropped, leaving the Leeds pair to battle it out.
The pair were together until Alistair stretched his legs at the 5km mark and pulled out gap of over half a minute.
That allowed him to receive the adulation of the crowd in the finishing strip and the 28-year-old collected a Union flag and strolled over the line.
Jonny crossed the line six seconds behind and the brothers collapsed to the ground together on the finish line.