Leinster have capped off another superb day of Irish rugby by beating Racing 92, 15-12 in Bilbao.
In what will be a superb year for Irish rugby, the Irish province won their fourth title by beating the French side who were determined to spoil the party.
The game which was battle throughout seen neither side score any tries but instead rely on the boots of their kickers.
It was that man Sexton who proved pivotal again for Leinster as he scored three decisive penalties to give Leinster in the game.
However penalties from Iribaren, seen both sides trading blows until the final 10 minutes.
But the outgoing Leinster legend Nacewa, gave Leinster the title with two important penalties, with the decisive one coming in the 79th minute.
Leinster who were made to work hard throughout made history as they went the entire tournament unbeaten to claim their fourth title.