96-year-old Prince Philip has been out of sight since his retirement last August from all Royal engagements.
Any event he now attends is carefully chosen, and its significance has to be great in order for him to emerge from his self-imposed retreat from public life.
So, when the Duke of Edinburgh failed to appear at a ceremony at Windsor Castle to officially hand over his role as Colonel of the Grenadier Guards to his second-born son, Prince Andrew, many wondered if he is suffering from a serious illness.
It is unlike the Duke to cancel once he has made a commitment, so the concern was not misplaced.
Although it was clear at the time of Prince Philip's retirement, that he would no longer be expected to attend any Royal engagements, it did leave open the possibility of some appearances.
In a statement, Buckingham Palace said: “The duke will not be accepting new invitations for visits and engagements, although he may still choose to attend certain public events from time to time.
“Her Majesty will continue to carry out a full programme of official engagement with the support of members of the royal family.”
So, why was Prince Philip a no-show at an event that he most assuredly thought was worth his time and effort, in spite of his retirement? Buckingham Palace declined to comment, but according to The Mail, the Duke was "feeling under the weather."
After all, he is no longer a young man and to have reached the age of 96 is quite an achievement.
Even more than that, having served his country for most of those 96 years, in one capacity or another, he is certainly due some much-needed and well-earned rest.
Let's pray that the Duke has many more vital years left and that we get the opportunity to see him from time to time as his wife, Queen Elizabeth II, continues in her busy schedule of events and Royal engagements.
Please enjoy these snaps of Prince Philip, with and without his lady-love Queen Elizabeth, throughout the years.