Classic-winning trainer Tommy Stack (70) is to retire at the end of the year, with his son Fozzy set to take up the reins at Thomastown Castle in Co Tipperary.
Stack began training in the 1980s and over a 30-year career he has sent out the winners of both the Irish and English 1,000 Guineas.
Las Meninas won the English classic at Newmarket in 1994, while three years later Tarascon, which also claimed Stack's first Irish Group One, won the Irish version under a young Jamie Spencer.
Stack also claimed two Group One successes Stateside - in the Beverly D Stakes in 1992 and the Garden City Breeders Cup Handicap in 2007 - as well as saddling Myboycharlie to win the Prix Morny at Deauville in 2007.
As well as his training success he is perhaps best-known for an illustrious career as a National Hunt jockey, which included winning the 1977 Grand National on board Red Rum.
Stack was also crowned British champion jockey for the 1975/75 and '76/77 seasons.
In a statement on his website, Stack said: "After some deliberation I have decided to retire at the end of the year when Fozzy, who has been an absolutely essential and integral part of everything here for the best part of 20 years, will take over the licence.
"We have had some memorable days all the way from Corwyn Bay to Myboycharlie and I must thank each and every one of our owners for their commitment and support during that time, while I have absolutely no doubt that many great days lie ahead for Fozzy here at Thomastown Castle."
Fozzy Stack has served as assistant to his father since 1999.
Noel Reid, who partnered Las Meninas to Stack's maiden Classic win, paid tribute to the trainer following the announcement.
He said: "Me and Tommy go back along way as I used to ride for Arthur Stephenson when he did. I rode the Flat horses and Tommy the jumpers.
"I was at Newmarket and Robert Sangster was there with Tommy and they asked me if I would ride Las Meninas in the 1000 Guineas.
"I said I would but the funny thing was near to the race I was offered the ride on Godolphin's horse (Balanchine) and I thought she would win, but I said I couldn't get let the other guys down.
"I stayed on Las Meninas and won the race. I'd never seen Tommy cry before!
"It was great for Tommy to win a Guineas. There's not many top jockeys who turn into top trainers, but Tommy bridged that gap and he's such a great guy.
"He's good to be around with Liz, his wife, and they are such a nice family. I still see them from time to time at the sales."
