The celebrations on the pitch were euphoric just as they were in pubs and living rooms across Ireland.
But 17 teams are resting easy and looking forward to the festival of football that will begin in Russia on June 14 next year.
Coleman became Wales manager in January 2012 following the death of his great friend Gary Speed. Brentford's Alan Judge had been given a berth on the wing.
Derry man and Republic of Ireland supporter, Conor Feeney, was watching the game live in the Banshee Bar in Boston, USA. With about 10 minutes of football played, the stewards at the home of Cardiff City Football Club finally relented and the Green Army's seats went unused for the duration of the final Group D qualifier.
Cast your minds back even further and to the qualifying for World Cup 2010.
Firstly, Doyle has had to sadly retire from football due to a series of concussions.
But football is about the here and now and in that sense, O'Neill is above all doubt until the World Cup play-offs take place.
David Meyler celebrating Ireland's victory over Wales.
The play-off path looks like it will be a lot trickier this time, given that Giovani Trapattoni pulled the plum draw when Estonia came out of the hat and O'Neill himself was favoured by fortune when UEFA paired his team with Bosnia Herzegovina. Meyler shunned calls for Pardew to be sacked for the bizarre incident, instead selecting him as his FUT team's manager after a fan vote.
"We might not be blessed with superstars like other nations, but we have got the togetherness and the willingness to get results, and that's what pulled us through".
Next summer's tournament in Russia will mark the 60th anniversary of Wales' only previous finals appearance, in Sweden in 1958.
Ireland captain, Seamus Coleman, was as nervous as the rest of us as he watched on from the sidelines in Cardiff.
But the result in Wales removes the need for further debate.
A play-off is the last obstacle facing both sides - and it's highly likely they will face either Italy, Croatia, Denmark, Portugal or Switzerland.
But then his Irishness is different from theirs: he comes from Londonderry/Derry, a place where the locals do not even agree on its name.
Daryl Murphy had nine wins while Ciaran Clark had seven. "I always fear them - and then we go out and beat them".
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