Prince Philip has spent a sixth night in hospital in London.
The Duke of Edinburgh, 99, was admitted to the private King Edward VII's Hospital on Tuesday evening as a precautionary measure after feeling unwell. He is said to have walked in unaided.
His eldest son Prince Charles was the first member of the royal family to visit when he made the 320 kilometre round-trip from his home in Gloucestershire on Saturday afternoon.
It is understood Charles wanted to visit his father due to Philip's extended stay.
Charles arrived in a Tesla car stepped out wearing a face mask, before leaving the hospital about 30 minutes later.
It is thought Charles had not seen his father since before Christmas because of the nationwide coronavirus restrictions, with Philip staying at Windsor Castle with the Queen.
The visit came the day after Prince Harry and Meghan Markle were stripped of their prestigious patronages, as the couple confirmed Megxit was permanent.
Philip, who turns 100 on June 10, is in hospital for an undisclosed reason, although it is not coronavirus-related.
The hospital's website states visitors will "only be considered in exceptional circumstances".
At Christmas, Buckingham Palace confirmed the Queen and Philip spent the holiday period together at Windsor, apart from the rest of the royal family.