Wicklow’s Helen Kearney landed Ireland's first equestrian success of the 2012 Paralympic Games in London with a remarkable silver medal thanks to a score of 76.700 percent on Mister Cool.
Kearney's score also helped Ireland win the dressage team bronze medal.
Great Britain have won team gold, with Germany taking silver.
Speaking after the event Kearney said: "I am absolutely thrilled. I felt confident and knew that I had done what I could to prepare.
"It is an amazing feeling, a dream come true. I saw my family and it inspired me to perform in the competition."
Horse Sport Ireland chairman, Joe Walsh added: "Today has been a remarkable achievement, especially as this was the first year that Ireland had qualified a dressage team for the Paralympics. My congratulations go to everyone involved in this wonderful success."
Kearney, who had previously won a bronze at the 2011 European Para-Equestrian Championships, has been competing in para-equestrian dressage for the last eight years.
A personal best was also achieved in the grade 1a championship by Dubliner Geraldine Savage with Blues Tip Top Too, when the duo finished in seventh place on a score of 68.800.
This morning, Kilkenny-born James Dwyer claimed sixth place in the grade IV individual dressage championships on 68.516, while Eilish Byrne with her chestnut gelding Youri on Saturday returned a score of 73.429 percent to place fifth in the individual Grade II competition.