[3] Conditions were very poor on the final day with the refreshment and press tents blown down and rain falling in torrents.

George Duncan, starting the final round 14 shots behind, scored 74 and finished with a total of 312, beating Smith by three and Cotton by one.

[4] After Duncan's win in 1927, the event was dominated by English golfers, the only other non-English winner before World War II being Bobby Locke in 1938.

[7] Charles Whitcombe dominated the 1930 tournament, winning by 8 strokes from defending champion Abe Mitchell.

Five players tied for second place, including Ernest Whitcombe who finished with a course-record 66 on the Royal Dublin links.

Bob Kenyon had a good chance to win for the third time but had 5s at the last two holes to finish a shot behind.

After his playoff loss in 1935, Reg Whitcombe won in 1936, two ahead of Bill Davies who was a runner-up for the third time.

[21] There was a second Irish winner at Royal Portrush in 1947 when Harry Bradshaw won the title, two ahead of Flory Van Donck.

[24] The 1950 tournament was won by the Australian Ossie Pickworth, two ahead of John Panton and Norman Von Nida.

22-year-old Peter Alliss had taken an early clubhouse lead on 274 but was eventually beaten by Weetman and then Brown, finishing in third place.

[26] After 1953, the event was not played again until 1975; plans to revive the tournament in 1970 were abandoned after backers Pepsi pulled out.

[29] Christy O'Connor Jnr became the third Irish winner, finishing one ahead of Harry Bannerman, and took the first prize of £5,000.

In 2010, the Irish Open at Killarney Golf & Fishing Club had an attendance of 85,179 over four days, second only to the BMW PGA Championship.

The European Open was held at the K Club in Straffan for thirteen years from 1995 to 2007 while the 2007 Seve Trophy and the 2006 Ryder Cup were the last important men's professional team competitions played in Ireland.

In April 2022 it was announced that The K Club had agreed a long-term deal with the European Tour, seeing them host the tournament in 2023, 2025 and 2027.

In early March, the European Tour confirmed the national championship would return to County Louth Golf Club, Baltray, which had last hosted in 2004, with a new sponsor, 3 Mobile.

In October 2015, it was announced that Dubai Duty Free had extended their sponsorship to 2018 along with the Rory Foundation.

[36] In February 2022, it was announced that Horizon Therapeutics would become the new title sponsor in a six-year deal lasting until 2027.