IrishRugby.ie takes a look back at how Eric Elwood's team won such a coveted prize.
WALES U-20 15 IRELAND U-20 17, Liberty Stadium
It all started with a hard fought win in the Liberty Stadium in Wales when Felix Jones, called up as a late replacement, struck for two tries for a stunning comeback by the Under-20s.
Scorers: Wales: Tries: Ken Owens, Martyn Thomas; Con: Rhys Priestland; Pen: Priestland
Ireland: Tries: Felix Jones 2; Cons: Ian Keatley 2; Drop: Keatley
IRELAND U-20 19 FRANCE U-21 16, Dubarry Park
Next up were reigning World champions France in Dubarry Park.
Ian Keatley sent over the match-winning kick for the second week running as Ireland's Under-20s stunned France.
Scorers: Ireland: Try: Richard Sweeney; Con: Ian Keatley; Pens: Keatley 4
France: Try: Jean Monribot; Con: Romain Sola; Pens: Sola 2, Francois Trinh Duc
IRELAND U-20 13 ENGLAND U-20 6, Dubarry Park
Eric Elwood's Ireland side remained on track for a crack at the Under-20 Six Nations championship and a Grand Slam as they edged past their English counterparts as Trinity winger Shane Monahan scored the only try.
Scorers: Ireland: Try: Shane Monahan; Con: Ian Keatley; Pens: Keatley 2
England: Pens: David Doherty 2
SCOTLAND U-20 8 IRELAND U-20 31, Falkirk StadiumIreland's Under-20s claimed the Triple Crown in Falkirk as they hit their Scottish counterparts for four tries in a 31-8 win.
Scorers: Scotland: Try: Richie Vernon; Pen: Cameron Ferguson
Ireland: Tries: Penalty try, Darren Cave, Richard Sweeney, Keith Earls; Cons: Ian Keatley 3, Niall Oâ00Connor; Pen: Keatley
ITALY 25 IRELAND 36, Stadio Santa Colomba
The St. Patrick's Day celebrations kicked off early in Benevento as Ireland's Under-20s produced a stunning comeback to beat Italy 36-25 and clinch a Grand Slam and Six Nations championship double.
Scorers: Italy: Tries: Paul Derbyshire, Natale Duca 2; Cons: Davide Duca 2; Pens: Davide Duca 2
Ireland: Tries: Cian Healy, Felix Jones, Darren Cave, Ian Keatley, Paul O'Donohoe; Cons: Keatley 4; Pen: Keatley
Manager - Phil Orr
Coach - Eric Elwood
Assistant Coach - Dan McFarland
Analysis - Denise Martin
Physio - Emma Gallivan
Doctor - Michael O'Brien
Grand Slam Celebration Pictures