The Duke of Edinburgh will not attend commemorations marking the Battle of Jutland in Orkney following medical advice.
Prince Philip, 94, is understood to have no plans to cancel any other forthcoming engagements, and has not attended hospital.
Descendants of those who fought at Jutland have been invited to join the commemorations, which includes a service at St Magnus Cathedral on Kirkwall on Tuesday.
Further events are planned with a service at Lyness Cemetery on the island of Hoy - the final resting place for more than 450 service personnel who died in the war, including sailors killed at Jutland.
The Princess Royal will be accompanied by Vice Admiral Sir Tim Laurence as vice-chairman of the Commonwealth War Graves Commission.