World Athletics president Sebastian Coe, who helped mastermind the London 2012 Olympic Games, has paid tribute to HRH Queen Elizabeth II following her death at the age of 96.
The monarch passed away at her home in Balmoral on Thursday, ending a seven-decade reign as the longest-serving sovereign in UK history.
Coe, who was appointed to the Order of the Companions of Honour for his work on London 2012, worked with the Queen throughout the event, and has now issued a lengthy tribute to her legacy.
"The Queen was such a beloved constant in the lives of so many people over so many years that it is hard to comprehend that she is no longer with us," he stated.
"She was on the throne before most of us were born and she lived a life of extraordinary service to the people of her country and the Commonwealth.
"In the most demanding of roles, she has shown exceptional leadership, grace, wisdom and fortitude, touching us across the full fabric of society, including sport.
"I will never forget her total commitment to the success of the London 2012 Olympic and Paralympic Games. She has been a source of continuity and comfort, and she will be grievously missed by us all.
"We will never see her like again. At this momentous time, my thoughts are with her family. I hope they are comforted by the support of a grateful nation, and of so many people around the world."
The President of the Commonwealth Games Federation Louise Martin also offered her condolences, adding: "It is with profound sorrow that we learn of the passing of our Patron, Her Majesty The Queen.
"Throughout her long life and reign, her extraordinary dedication and service to the Commonwealth has been an inspiration to so many, including all our Commonwealth Games athletes and officials.
"Her Majesty's vision for the Commonwealth as a diverse and united family of nations will continue to inspire us – and will remain our mission and duty for the benefit of all athletes and communities, through the power of sport.
"Our thoughts and prayers are with His Majesty The King, The Queen Consort and all members of the Royal Family as we join with citizens across the Commonwealth in mourning her loss at this very sad time."