Question: When did ireland rugby last win the grand slam?
Disambiguated questions and answers: question: When did ireland rugby first win the grand slam?
When did ireland rugby last win its second grand slam?
When did ireland rugby last win its third grand slam?
answer: 29 March 1948
21 March 2009
10 March 2018
Natural Questions answer: 2018 (from the Wikipedia article "Grand Slam (rugby union)")