He died at 99.
“His Royal Highness passed away peacefully this morning at Windsor Castle,” the royal family announced.
“Further announcements will be made in due course. The Royal Family join with people around the world in mourning his loss,” it added.
Philip spent 65 years supporting the queen, retiring from his public role in 2017 and staying largely out of the view since.
In his active years, he helped set a new course for the monarchy under a young queen, championing Britain itself, as well as environmental causes, science and technology.
The Greece-born royal, whom the queen referred to as “my strength and stay,” was hospitalized in February 2021 after “feeling unwell,” and was treated for an infection and a preexisting heart condition, Buckingham Palace said. He was released a month later after undergoing a heart procedure.