Welsh triumphed 25-7 in a pulsating atmosphere at the Millennium Stadium to clinch its first title since 2013 and first Grand Slam for winning all five matches since 2012.Center Hadleigh Parkes scored a try after 80 seconds and fly-half Gareth Anscombe kicked 20 points as Wales’ earned a fourth Grand Slam of the Six Nations era and third under Kiwi coach Warren Gatland, who is leaving his post after this autumn’s World Cup.The win also extended Wales’ record to 14 straight victories in its last competitive encounter before the World Cup. Going into the final weekend, Wales, Ireland and England all still had a chance to win the title, but the Welsh sealed the championship before England’s match against Scotland later Saturday.”I’m proud of the players, it’s not about me,” said Gatland, who becomes the first coach in history to win three Grand Slams. “We spoke beforehand about playing for themselves and their families and this crowd and Wales as a whole, and being able to create a bit of history. It was a dazzling performance by us.” Minute’s silenceAhead of the game, players and fans observed a minute’s silence for the victims of the mass shooting in Christchurch, New Zealand, in which at least 49 people died. New Zealand has won the last two Rugby World Cups and both Gatland and Ireland coach Joe Schmidt are Kiwis. Wales had changed the narrative of the tournament when it came from behind to defeat England 21-13 in the third round, and by remaining unbeaten it kept the destiny of the title in its own hands going into the final weekend. With the stadium roof open to the deluge — as requested by Schmidt — Wales stormed into the lead after little more than a minute when Parkes chased Anscombe’s chip over the top to touch down. An Anscombe conversion and three further penalties gave Wales a comfortable cushion at the break as Ireland lacked discipline and failed to find any kind of rhythm.Ireland’s slim chance of winning the title relied on beating Wales and hoping Scotland defeated England at Twickenham. But Schmidt’s side had a mountain to climb to reverse the 16-0 half-time deficit — despite Wales having done just that in its opening match in France.But the mountain only got steeper after the break, when Anscombe added two further penalties, and from then on Ireland appeared a spent force.One solitary probe got to within yards of Wales’ line midway through the half, but the men in red repelled the green invaders, and when Anscombe made it seven kicks from seven the result was virtually assured.The home crowd’s melodic singing and deafening roars drowned out the last 10 minutes as Ireland attempted a desperate final surge. At the death Ireland manufactured a try for Jordan Larmour but the final whistle sparked jubilant Welsh celebrations.