The Republic of Ireland and Wales go head-to-head in Dublin on Friday night in a game which could prove pivotal to their respective hopes of making it to the 2018 World Cup finals in Russia.
Here, Press Association Sport highlights five previous meetings between the two nations.
REPUBLIC OF IRELAND 0 WALES 1 - Friendly, Lansdowne Road, March 26, 1986
Jack Charlton would go on to achieve plenty of success as Ireland manager but his time in charge of the Green Army began with defeat to Wales.
Ian Rush would score the only goal of the game as Mike England's side ruined Charlton's party, with John Aldridge and Ray Houghton handed their first Ireland caps.
Rush's header put pay to Ireland but Wales goalkeeper Neville Southall was forced off with a broken ankle.
WALES 0 REPUBLIC OF IRELAND 3 - Friendly, Racecourse Ground, February 6, 1991
After Charlton guided Ireland to the quarter-finals of the 1990 World Cup in Italy, he would then avenge the defeat suffered in the Lansdowne Road friendly just under five years earlier.
Terry Yorath was at the helm for the hosts, who boasted the likes of Rush, Gary Speed and Dean Saunders among their ranks but were still overrun by Ireland.
Niall Quinn bagged his first international brace to put the visitors in charge before fellow striker John Byrne wrapped up the win with three minutes remaining.
REPUBLIC OF IRELAND 1 WALES 0 - Euro 2008 qualifier, Croke Park, March 24, 2007
A decade before Friday's World Cup qualifier, the pair met in what was a game of firsts in Dublin.
It was the first football match to be played at Croke Park, Ireland's premier Gaelic venue, and the winning goal was scored by Stephen Ireland - his maiden strike for his country.
The win eased pressure on then-manager Steve Staunton and all-but ended Wales' qualification chances, with Ireland latching onto a through ball from Robbie Keane to finish well and wrap up the win for the hosts.
WALES 2 REPUBLIC OF IRELAND 2 - Euro 2008 qualifier, Millennium Stadium, November 17, 2007
Neither side could reach Euro 2008 by the time they met in Cardiff towards the end of the qualification process, but they still produced a rousing display.
Both had been left behind by the Czech Republic and Germany, although Ireland could still finish third if results went their way.
Don Givens was in temporary charge of the visitors, who fell behind to a Jason Koumas header only to take the lead themselves as Robbie Keane and Kevin Doyle struck either side of half-time.
John Toshack's Wales would rally to take a share of the spoils, with Koumas converting an 89th-minute penalty after Paul McShane had fouled David Cotterrill.
REPUBLIC OF IRELAND 3 WALES 0 - Nations Cup, Aviva Stadium, February 8, 2011
Giovanni Trapattoni's Ireland got their Nations Cup campaign off to a flyer with a comfortable victory over a Wales side under the stewardship of Gary Speed for the first time.
This was the opening match of the ill-fated Nations Cup, won by Ireland but abandoned after just one tournament following poor attendances.
The hosts were by far the better side in this meeting, with Darron Gibson opening the scoring with a typically powerful strike to record his first senior goal, with Damien Duff and Keith Fahey also getting on the score sheet.