The stone marking Henry VIII's foundation of Dockyard at Deptford has been found behind a false wall at University College London.
The Duchess of Cambridge took part in a nursery rhyme session and played with a frog hand puppet during her visit to a Middlesex hospice.
A boy serving volleyballs at the Duke of Cambridge joked that he "felt sorry" for William after he was unable to return them.
It's one of the most gruelling endurance races in the world - rowing 3,000 miles in 48 days across the Atlantic. And, today, Prince Harry was in Oxfordshire to praise the crew, including two injured ex-servicemen, for successfully completing the toughest challenge of their lives.
The Prince was in Henley-on-Thames at the home of rowing and the 'Row to Recovery' charity.
The race has been supported by the Endeavour Fund - set up by him - to encourage more wounded veterans to take up the sport. Mel Bloor was at the Royal event.
Interviewees:Cpl Scott Blaney, crew member and Catherine Yoxall from The River and Rowing Museum.
Prince Harry is in Henley to meet the Row to Recovery crew of wounded ex-servicemen who successfully rowed across the Atlantic last year. The adventure was backed by the Endeavour Fund, created by The Royal Foundation of The Duke and Duchess of Cambridge and Prince Harry.
To mark Commonwealth day, The Queen will 'break' the Commonwealth Flag outside the Great West Door of Westminster Abbey.
It will be the largest, single raising of this flag in the history of the Commonwealth.
Prince Harry received a pop star reception from young volunteers amid screaming and cheering from fans - but joked that he was sorry for those "who were expecting Harry Styles".
He said: "For those of you expecting Harry Styles, I apologise, and no I am not going to sing."
The prince was a guest at the We Day UK event at north London's Wembley Arena.
He said that Free the Children was a "fantastic" organisation "founded on an inspiring principle - that children have the power to affect change".
The Duke of Edinburgh was given a real taste of Army life with some colourful barrack-room language as he visited the 1st Battalion Grenadier Guards at Aldershot.
Normally, soldiers are on their best behaviour for a royal visit, but one player in a football match could not contain himself from complaining in no uncertain terms how tired he was after being substituted in a game between corporals and guardsmen.
Doubled up in pain and exhaustion on the touchline, the soldier appeared unaware Prince Philip was standing only five yards away as he went through a lexicon of swear words to describe his agony.
"Are you all right? asked the Duke, who was talking to a group of sergeants on the touchline. "No, I'm f*****," said the soldier, still bent double with his head down.
Philip, 92, no stranger to the odd swear word after a career in the Royal Navy, laughed and then continued to chuckle away to himself as the substituted player finally looked up and walked off looking slightly sheepish.
The Duchess of Cornwall will visit the Trinity Hospice in Clapham later.
Trinity Hospice is the oldest hospice in Britain, and provided care to more than 2,500 people with a range of terminal illnesses last year.
Over 450 of those patients were treated at the charity's inpatient center in Clapham.
The Hospice receives just a third of its income from the NHS, and needs to raise more than £7 million every year.
The Duchess of Cambridge has visited a charity project in north-west London. At Northolt High School Kate opened a newly refurbished room that has been transformed into a tranquil art studio and rest space with funds donated by global brokers Icap.
During her visit the Duchess joined a group of nine children who sat at large table in the art room creating still life paintings of pieces of fruit.
Kate, who is the Art Room's royal patron, spent more than half an hour chatting to the six girls and three boys and could be heard asking the youngster if they enjoyed their time in the lesson.
The Duchess of Cambridge's involvement in charities such as the Art Room has "raised its profile undoubtedly", the chairman of the board of trustees said today, after she opened a new art therapy room at a school in West London.
Jo Lloyd Jones, chairman of the Art Room's board of trustees, spoke about the work his organisation does:
We take children at risk of exclusion, who are not coping for a wide range of reasons, and, using art techniques, are able to establish them back into main stream schools, giving them confidence and the ability to cope.
The important thing is she's genuinely interested in what we've done, there's a commitment on her part and we feel very privileged.