Wallabies flanker Scott Fardy has helped Leinster equal Toulouse's record of four European Champions Cup titles, as the Irish side eked out a 15-12 win over injury-ravaged Racing 92 in Saturday's final in Spain.
Ireland five-eighth Johnny Sexton kicked three penalties and Isa Nacewa slotted two as the Irish province added to their 2009, 2011 and 2012 triumphs in the continent's most prestigious club competition.
Racing, who were never behind until Nacewa's late penalty, replied with four penalties by stand-in halfback Teddy Iribaren after suffering a major setback before kick-off when former New Zealand superstar Dan Carter was ruled out injured.
"It was a real arm wrestle. So delighted to come out on the right side of the result," Leinster coach Stuart Lancaster said.
"I thought Racing were outstanding today, really put pressure on us at the breakdown."
Racing suffered their second final defeat in three years.
"We failed. They did what they had to do to win the game. They deserved to win," Racing coach Laurent Travers said.
The French side paid for their lack of discipline.
"We were very close. I think we could have won. At our level it is all about details and our discipline was poor in the first half," flanker Yannick Nyanga said.
"We had a big heart today, but that's not enough."
Racing came close to forcing extra time after the buzzer when stand-in flyhalf Remi Tales's drop goal flew just wide.
Racing, also missing first-choice playmaker Maxime Machenaud, suffered a major blow when Carter, named on the replacements bench, was ruled out an hour before kickoff due to a hamstring injury.
Pat Lambie then sustained a knee injury in the second minute, so French international Tales, who did not feature on the team list in the morning, had to deputise.
Racing went ahead with an Iribaren penalty but Sexton levelled.
They traded a couple more penalties before the interval after the French side defended aggressively, disrupting Leinster's usually well-oiled machine.
The normally free-flowing Irish side, who had scored 31 tries in eight games in the competition, were being kept at bay.
Racing took command in the second half as they went through the phases and were rewarded with an early penalty converted by Iribaren.
But Sexton responded with a penalty and Iribaren's fourth penalty was cancelled out by Nacewa's boot.
Another Racing offside infringement was sanctioned by Wayne Barnes and winger Nacewa coolly slotted home the winning kick one minute from time.