Ireland national rugby union team tournament. It is contested against England, France, Italy, Scotland and Wales. Ireland was a member of the inaugural Home Nations in 1883, with France and Italy joining later to form the Five and Six Nations respectively. Ireland won their first championship in 1894, also winning the Triple Crown. Ireland's first Grand Slam occurred in the 1948 season and their second in the 2009 season. In total Ireland have been outright champions on fourteen occasions following their title in the 2018 Six Nations Championship and have nine shared wins. Ireland won their third ever Grand Slam in the 2018 Six Nations
1990 Five Nations Championship Grand Slam win, as they have yet to win a Grand Slam since Italy joined what became the Six Nations Championship in 2000. The teams involved were: 1990 Five Nations Championship The 1990 Five Nations Championship was the 61st series of the Five Nations Championship, an annual rugby union competition between the major Northern Hemisphere rugby union national teams. The tournament consisted of ten matches held between 16 January and 24 March 1990. The tournament was the 61st in its then format as the Five Nations. Including the competition's former incarnation as the Home Nations Championship, the 1990 Five Nations