By Stephen Barry

Today marks the 80th birthday of Big Jack Charlton, Ireland's legendary football manager - and his big day has been celebrated online with glowing tributes.

He may have won the World Cup with England in 1966, alongside his brother Bobby, but he's best remembered on these shores for his decade in charge of the Boys in Green.

In that time, he led Ireland to our first ever European Championship in 1988 and our inaugural World Cup appearance in 1990, achieving a best-ever finish by reaching the quarter-finals.

His team were back at the World Cup in 1994, where they made it to the second round, picking up a famous victory over eventual finalists Italy in the opening game.

Charlton also enjoyed an excellent record against his native country, with Ireland never tasting defeat to England in five clashes.

His 23-year playing career with Leeds United featured a First Division title in 1969, an FA Cup success in 1972 and he retains the club record for most appearances, alongside Billy Bremner with 773.

Happy 80th birthday to Jack Charlton, who played 35 times for the #ThreeLions and was a World Cup winner at @wembleystadium 1966.

Jack Charlton of Leeds chases Man Utd's George Best pic.twitter.com/TLhDC6nRpB — The League Magazine (@Theleaguemag) April 29, 2015

HAPPY BIRTHDAY: Many happy returns to the great Jack Charlton, who celebrates turning 80 today! #lufc pic.twitter.com/cdqFVrDLKL — Leeds United (@LUFC) May 8, 2015

Happy birthday to Jack Charlton, who is 80 today. What are your memories of Jack's career? pic.twitter.com/csJyRHh1w0 — E F L (@EFL) May 8, 2015

Happy 80th birthday big Jack and thanks for all the amazing memories!! pic.twitter.com/OxRVoLI701 — FAIreland ⚽️🇮🇪 (@FAIreland) May 7, 2015

So a big happy birthday to Big Jack!