With regional bragging rights up for grabs, cheap ticket prizes and lots of entertainment under the roof in Cardiff, the event proved an instant success with Welsh rugby fans.
Scarlets and Cardiff Blues won in that inaugural double header in 2013 which was described as a "historic moment for Welsh Rugby" by WRU chief executive Roger Lewis.
The festival of rugby on March 30 saw over 35,000 fans from across the country descend on the Welsh capital.
The 2013 event also capitalised on the euphoria of Wales' back-to-back Six Nations title after a Grand Slam success a year earlier.
In the opening game, Scarlets kept their push for the PRO12 play-offs with a hard-fought 28-20 victory over Newport Gwent Dragons thanks to a brace of tries from a Northampton-bound George North.
Scarlets raced into a 10-0 lead thanks to an Owen Williams penalty and North's first try but scrum-half Jonathon Evans dummied past an isolated Scarlets prop and sprinted 30 metres to bring the Dragons back into it.
A penalty from full-back Tom Prydie with the last kick of the half levelled the scores.
After an exchange of penalties it was a moment of brilliance from centres Scott Williams and Jonathan Davies which saw the latter cross the try line that put Scarlets back in control.
North's second try gave Scarlets breathing room but a second try from man-of-the-match Dan Evans brought the Dragons within touching distance of a losing bonus point which they were unable to secure.
In the second fixture, Leigh Halfpenny gave a glimpse of what British & Irish Lions fans could expect in their upcoming tour of Australia as he scored all 16 points for Cardiff Blues.
But it wasn't enough for a side who play their home fixtures next door to Principality Stadium as Ospreys ran out 23-16 winners.
Cardiff opened the try-scoring after good work from Rhys Patchell released captain Gavin Evans. The centre found support from Harry Robinson and an inside pass to Halfpenny allowed him to cross.
A powerful break from Justin Tipuric led to further trouble for the Blues as the flanker, under pressure from Halfpenny, passed to Jonathan Spratt to score the Ospreys' second try.
Trailing by ten points at half-time, the Blues added two penalties to Ospreys' one in the second half to ensure they didn't miss out on a losing bonus point.
The successful first Judgement Day has been repeated every year since with Wales captain Sam Warburton full of praise for the event.
He said: "Judgement Day is a fantastic occasion for the fans and great value for families; two games of rugby, a great atmosphere and sheltered from any poor weather conditions, it guarantees to be a great day out."
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