The heroics of 'El Fenomeno' at the 2002 World Cup for Brazil are etched into history, though not many recall that he also represented his country at the Olympics.
Back in 1996, Ronaldo, then, 19, topped a star-studded Brazil team who attended the Atlanta games in the USA.
The tournament was for under-23 players, with three exceptions permitted.
Rivaldo (24), Bebeto (32), Juninho (23), Roberto Carlos (23) and Dida (22) also featured in their side.
They were determined to bring home Brazil's first ever Olympic gold for football, but would be met with fierce opposition.
Argentina took Diego Simeone (26), Roberto Ayala (23), Javier Zanetti (22) and Hernan Crespo (21) to the tournament.
Italy brought Alessandro Nesta (20), Fabio Cannavaro (22) and Gianluigi Buffon (18).
Spain enlisted Raul (19), Fernando Morientes (20), and Gaizka Mendieta (22).
And France had Robert Pires (22), Sylvain Wiltord (22) and Claude Makelele (23) in their squad.
Amid the abundance of talent at the tournament, Ronaldo was the clear star name of the future.
However, he didn't even play under his own true name.
Back in the early stages of his international career, Ronaldo was actually known as 'Ronaldinho' (which means little Ronaldo in Portuguese) and had that name on his shirt.
This was because Ronaldo Rodrigues de Jesus, his older teammate at the 1994 World Cup, was also called Ronaldo and nicknamed 'Ronaldao' (which means big Ronaldo).
When the true Ronaldinho initially joined the Brazil setup, he had to be known as 'Ronaldinho Gaucho' so he wasn't confused with R9.
Eventually, El Fenomeno became the oldest Ronaldo and reclaimed his true name, but at the 1996 Olympics, Ronaldo also went under 'Ronaldinho' as another teammate, Ronaldo Guiaro, was two years older than him.
R9's Brazil were drawn in a group with Japan, Hungary and dark horses Nigeria.
Remarkably, they lost their opening game 1-0 to the Japanese, but Ronaldo came alive in the other two group matches.
El Fenomeno knocked home Brazil's first goal of the tournament in their 3-1 win over Hungary with Juninho and Bebeto also finding the net.
Then, in the final group game against Nigeria, Ronaldo blasted his side to a 1-0 win with a goal from outside the box.
In their quarter-final against Ghana, the 19-year-old took centre stage again and bagged a brace in a 4-2 win.
Next, owing to the format of the tournament, Brazil met Nigeria again in the semi-final.
The result appeared pre-determined given the 1-0 win that had gone in Brazil's favour just six days prior.
Flavio Conceicao put Brazil ahead in the opening minute, but this time Nigeria hit back as Roberto Carlos scored an own goal.
Before half-time though, Conceicao scored again and Bebeto added a third to put Brazil in a commanding lead.
With 15 minutes to go, they seemed destined for the gold medal match.
However, Victor Ikpeba scored in the 78th minute to inspire a remarkable recovery and 19-year-old Nwankwo Kanu levelled the game in stoppage time.
Kanu then scored a golden goal winner early in extra-time to astonishingly dump Ronaldo's favourites out of the competition - 4-3 the final score.
Nigeria, who also had Taribo West (22), Celestine Babayaro (17) and Jay-Jay Okocha (22) among their ranks, went on to upset Argentina 3-2 in the final and win a highly unexpected gold medal.
Brazil were left in the bronze medal match.
Ronaldo found the net once more in a 5-0 thrashing of Portugal to make sure he left with a medal, albeit not the one he wanted.
Ronaldo recalled to InsideTheGames years later: "It was an amazing experience.
"Brazil played really well up to the semi-final when we were 3-1 up against Nigeria with 10 minutes to go.
"Unfortunately the team fell asleep and managed to lose 4-3, and could not realise the dream of the gold medal…
"My bronze medal is important - all athletes dream of an Olympic medal and for that reason [mine] is at home in an important place.
"I think that the Olympics are very important throughout the world for all athletes.
"Football is such a big passion worldwide that the World Cup is always going to be the most wanted trophy but the Olympics is such a good chance for the under-23 players, to promote these talents on the world scene."
Ronaldo scored five goals at the 1996 Olympics and lit up the games with his youthful exuberance, even though an imposter named 'Ronaldinho' claimed all the credit.