Philip, 96, was operated on earlier on Wednesday in a planned procedure after suffering with a hip problem for about a month.
"His Royal Highness The Duke of Edinburgh was admitted to King Edward VII Hospital in London this afternoon, for planned surgery on his hip, " Buckingham Palace informed in a statement. "He is progressing satisfactorily at this early stage", the palace added in a statement. "He is comfortable and in good spirits".
Back in August 2017, the Duke retired from 65 decades of public service, significantly more than 5 decades after the Palace originally explained he would steadily "wind down" his workload, nevertheless he remained keen to carry out a number of his own obligations.
The aging royal did not attend Easter services with the Queen over the weekend because he was having problems with his hip.
"Any operation and any anaesthetic carries some risk", she said. "That's more important than someone's chronological age".
Philip has been in generally good health for his age, but he was briefly hospitalised over Christmas in 2011 for angioplasty treatment of a blockage in his coronary arteries.
Also invited will be 200 people from various charities associated with the couple, 100 students from two local schools, 610 Windsor Castle community members and 530 Members of The Royal Households and Crown Estate.
A source previously told ET that the Duke has been experiencing health issues for quite a while, and has "been admitted to the hospital several times in recent years".
"He has, quite simply, been my strength and stay all these years" the queen said in a golden wedding anniversary speech in 1997.