Zara Phillips has dedicated her World Three-Day event victory to her friend Sherelle Duke, who died last week.
Zara Phillips pictured after her emotional win in Aachen, Germany
The Portadown rider, 28, died when her horse fell on her at a cross-country event in Southampton.
The Queen's granddaughter, 25, said: "I went out today to do it for a friend of mine who died a week ago today and to try and get her a gold medal.
"I was just so relieved that I managed to give that to her, because we didn't manage to go over and say goodbye."
Miss Duke was laid to rest on Friday at Mullavilly Churchyard.
Her boyfriend, Ross McCandless, had earlier told mourners at Portadown Baptist Church on Friday of his "undying love" for the former World Young Rider Champion.
Among the mourners were senior Dublin politicians and Zara Phillips's brother Peter.
A rider's hat was on top of the coffin as it was brought into the church by mourners.
Sherelle Duke was killed when her horse toppled on top of her
Miss Duke was a member of the Irish equestrian team in the 2003 European Championships.
Her family is well-known in the Portadown area and in the business world after setting up the Dukes Transport Company.
For years she rode in the company's colours of red and white.
Equestrian journalist Ruth Loney told the BBC's Talkback programme that Zara's brother Peter Phillips had attended Sherelle's funeral on Friday.
"Zara was devastated when the accident happened, but the team were already in Germany preparing for the world championships," she said.
"The whole team of the British and Irish took Sherelle's colours of red and white and had a little ribbon on their lapels throughout the competition."
The journalist said Zara's mount, Toytown, was a "very honest Irish horse" which had been bought "very cheaply by (her father) Mark Phillips".
Zara is the daughter of the Princess Royal and her former husband Captain Mark Phillips.
Her win in Aachen, Germany, means she has eclipsed the riding exploits of her parents, neither of whom won a world title.
She is now second-favourite with some bookmakers to win the BBC's Sports Personality of the Year, behind Andy Murray but ahead of Monty Panesar, Steven Gerrard and David Walliams.