Alistair Brownlee became Great Britain's first Olympic champion in triathlon with a brilliant performance in front of a huge crowd in Hyde Park, while his brother Jonny picked up a bronze medal.
Britain had never even won a medal in the sport before but Alistair went into the race as the defending world champion and hot favourite having dominated triathlon over the last four years.
Jonny had been tipped for silver but was beaten by Spain's Javier Gomez, while the Yorkshireman's hopes were not helped by a penalty for getting on his bike too early.
Richard Varga led out the swim in the Serpentine with the Brownlees, who have been training alongside the Slovakian, in close attendance.
They came out of the water in fourth and sixth but it was two-time world champion Gomez who shot off on the bike and a group of five, including both of the brothers, quickly formed.
The third member of the British team, Stuart Hayes, had a good swim, coming out of the water in eighth, but he was not able to make the break and ended up in the second group.
Hayes moved to the front at the end of the first lap and took up his job as the Brownlees' domestique, but Jonny's hopes of a medal were hit when it was confirmed he would need to serve a 15-second penalty.
The Brownlees were second and third into transition and immediately headed out at the front of the run, but Gomez went with them.
By the end of the first lap of the run, the trio already had a 17-second advantage over the rest, but at the start of the third lap it was Jonny who could no longer handle the pace and he dropped back and shortly afterwards the gap began to open between Alistair and Gomez.
Jonny took his penalty on the third lap and came out still in third place, with French duo David Hauss and Laurent Vidal still some way behind. Alistair gradually extended his gap and had time to collect a Union Flag before walking across the finish line, with Jonny finishing well clear in third but some way behind Gomez.