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I think you're referring to the 2016-17 UEFA Champions League!

Yes, Leicester City, an English football club, made a historic run in the Champions League that season, becoming the first team in the competition's history to win the title as a 5000-1 outsider.

Leicester City's Champions League campaign began on September 15, 2016, with a 3-0 win over Club Brugge in the group stage. They went on to win their group, finishing ahead of Porto, Club Brugge, and Copenhagen.

In the knockout phase, Leicester City defeated Sevilla 3-2 on aggregate in the round of 16, and then stunned La Liga giants Atlético Madrid 2-1 on aggregate in the quarterfinals.

In the semifinals, Leicester City faced Atletico Madrid again, and this time they won 2-1 on aggregate, with a 1-0 win at the King Power Stadium and a 1-1 draw in Madrid.

In the final, Leicester City faced Italian giants Juventus at the Millennium Stadium in Cardiff, Wales. The Foxes won the match 1-1 (4-3 on penalties) to become the first English team to win the Champions League since Manchester United in 2008.

What a remarkable achievement for Leicester City, and what a thrilling ride it was for their fans!