The British veteran who raised over $40 million for the U.K's National Health Service was knighted by Queen Elizabeth.
Capt. Tom Moore raised the money by walking the length of his garden 100 times during the coronavirus lockdown. His original goal: $1,200 by his 100th birthday.
As Moore's campaign went viral, donations flowed in from around the world.
"The sum of money got bigger and bigger and bigger, and I was overwhelmed by the very fact that that sum of money came by me doing a little walk up and down this path," Moore said in a May interview.
Friday's ceremony was the queen's first public appearance in months.
The royal has been self-isolating at Windsor Castle since March due the pandemic.
Ahead of the event, Moore said he was "overwhelmed" by the chance to meet the queen.
"It isn't everybody who gets the chance to see the queen, is it? I think that's going to be absolutely marvelous for me," said the captain.
Moore joked about having to kneel.
"If I kneel down, I'll never get up again.”
Moore has inspired people of all ages to raise funds by walking, including a 9-year-old with cerebral palsy and autism.
U.K. Prime Minister Boris Johnson has also thanked Moore.
"Let's take the selflessness and the love of the health and the care workers and the charities, the public spirit and the good humor of the entire population. And let's brew them together with the superhuman energy of Captain Tom, bounding around his garden at the age of 100 and raising millions for charity," Johnson said during a press conference last month.