Eliud Kipchoge made history by becoming the first person to run a marathon in under two hours on Saturday.
The Kenyan distance runner recorded a historic time of one hour, 59 minutes and 40.2 seconds as he took part in an INEOS challenge event in Vienna.
Kipchoge, 34, was joined by 42 support runners who all rotated in at different stages of his effort, while a pace car projected a laser to help him track his time.
The four-time London Marathon winner broke new ground, although his time over the 26.2 mile distance will not be recorded as an official world record due to it not taking place in a professional race.
Kipchoge had previously attempted the feat in May 2017 at the Monza racing circuit, finishing 25 seconds outside the mark on that occasion.
This time around, he ensured October 12, 2019 will be a date that goes down in the history books.
"After Roger Bannister in 1954, it took another 63 years - I tried and I did not get it," said Kipchoge of his efforts to reach the astonishing achievement, referencing Bannister's famous four-minute mile.
"After 65 years, I am the first man. I want to inspire many people to know that no human is limited.
"Now I've done it, I am expecting more people to do it after me."
1954 Roger Bannister breaks the 4-minute mile
1969 Neil Armstrong walks on the moon
2009 @UsainBolt runs 100m in 09.58
2019 @EliudKipchoge runs a sub two-hour marathon#INEOS159 #NoHumanIsLimited pic.twitter.com/HMXnxRohE3
— INEOS 1:59 Challenge (@INEOS159) 12 October 2019
Kipchoge holds the official world record, which stands at two hours, one minute and 39 seconds.
In his attempt on Saturday, at the halfway point he was projected to finish with 11 seconds to spare and as the second hour of his effort progressed it began to look increasingly likely he would accomplish that.
With six kilometers to go he was still 10 seconds inside his target and he accelerated from there to come in more comfortably than the initial splits had suggested.
Kipchoge knew he had done it as he approached final straight and repeatedly pointed to the lively crowd who roared him on.
He raised his arms and hugged his wife, Grace, as soon as he crossed the line, before being greeted by his support team and celebrating with his ecstatic pacemakers while raising the Kenyan flag.
"Absolutely remember all the pacemakers are among the best athletes ever in the world," Kipchoge said of his fellow runners, who were all elite middle and long distance performers.
"I can say thank you to them, I appreciate them for accepting and together we made history on this one.
"Together, when we run, we can make this world a beautiful world and a peaceful world. My wife and three children, I am happy for them to come and witness history.
"I am feeling good. This shows the positivity of sport. I want to make it a clean and interesting sport."