Olympian Chris Hoy became the first Briton in a century to win three gold medals at the same Games.
He won the all-British men's sprint final against team mate Jason Kenny, who clinched silver.
The Scotsman, with an audience including Tony and Cherie Blair, added to his wins in the team sprint and the Keirin.
He is the first British athlete to win three gold medals in a Games since swimmer Henry Taylor at the London games in 1908.
Hoy has achieved gold in four separate Olympic events to date - he won the 1km time trial at Athens in 2004.
Victoria Pendleton also scooped gold in the women's sprint, with a seemingly easy victory against Australia's Anna Meares.
She missed out on a medal at Athens, and nearly gave up competing internationally because of the disappointment.
Pendleton told the BBC: "It's taking a while to sink in. I can't believe it all went to plan."
Fellow British cyclist Bradley Wiggins missed out on his chance of a third gold in the Madison with partner Mark Cavendish.
The pair came eighth overall - the end of a tough Olympic schedule for Wiggins, who had already won gold in the individual and team pursuit events. Argentina took gold, Spain silver and Russia bronze.
