The Duke of Edinburgh has been admitted to hospital for a planned operation on his hip, Buckingham Palace has said.
Prince Philip had announced his retirement from all public duties as the Duke of Edinburgh in May, 2017 owing to his age.
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Officials declined to provide additional details about the surgery and said "further updates will be issued when appropriate".
The Duke did not accompany the Queen to church at St George's Chapel, Windsor Castle, on Easter Sunday because of a problem with his hip.
In 2013, the royal household said Philip had once again been admitted to the hospital for exploratory surgery after his doctors revealed that it was necessary following "abdominal investigations". At times blunt to the point of rudeness, Philip is Elizabeth's most important support.
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He added: "We do not have a contract, any understanding, formal or informal, with Israel for them to dump their refugees here". After meeting with angry residents of south Tel Aviv on Tuesday, Netanyahu says he reconsidered after hearing their concerns.
However, the Duke of Edinburgh attended Christmas services with his family in December, and was seemingly in good spirits.
Sources said that his absence was "nothing to be concerned about".
Philip also missed an engagement on March 22 because of his hip. He became a naturalised British citizen and adopted the surname Mountbatten.
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He was born on a dining room table on the Greek island of Corfu on June 10, 1921, the fifth child and only son of Prince Andrew of Greece.