WATCH: Jessica Harrington pays classy tribute to Henry de Bromhead after Sizing John's Gold Cup glory
Jessica Harrington became the leading lady trainer in the history of the Cheltenham Festival with Supasundae's win in the Coral Cup and now she is a Gold Cup-winning trainer.
Sizing John dismissed all the doubts over whether or not he would get the trip with a terrific staying display.
The win also provided a career highlight for jockey Robbie 'Bunny' Power.
The victory for the 7/1 shot will be very popular in the weighroom.
The Moone handler has previously masterminded Jezki's 2014 triumph in the Champion Hurdle and will forever be remembered for her association with the legendary Moscow Flyer.
Owned by Ann and Alan Potts, Sizing John and Supasundae, moved to the Harrington operation in south Kildare having previously been trained by Henry de Bromhead and has found a new lease of life over longer distances after spending much of his career playing second fiddle to Douvan over two miles.
Harrington was quick to compliment the role the Waterford trainer played on today's triumph
"I do feel very sorry for Henry de Bromhead because he did all the hard work on this horse and Supasundae and I only inherited it in September and it's been a learning curve for me because I had to get to know them, how to train them and what their little quirks were but Henry had probably bought the horses and done all the work on them when they were young horses," she said.
Harrington and Robbie Power followed up their Gold Cup success with Sizing John when Rock The World took the last race of this year's Cheltenham Festival, the Johnny Henderson Grand Annual Challenge Cup.
Power charged through on Rock The World (10-1) to lead at the final fence and storm up the hill to win from Gardefort with Theinval third and Dandridge fourth.
It was Ireland's 19th win of the week to Great Britain's nine.