King Charles is said to have a 'spring in his step' as the Sovereign looks forward to the 'second chapter' of his reign.
The start of Charles's reign has been blighted by deepening rifts with his son Prince Harry and his brother Prince Andrew as well as Kate Middleton and the King's surprise cancer diagnoses.
However, as his reign enters its third year, the King is said to be eager to return to work with a 'renewed vigour.'
A source told the Daily Mirror: 'There has been a lot going on, but the King has always been upbeat. Not once has he allowed himself to question the future – he's dealt with everything head on.
'Now he is back in business. There is a spring in his step and a renewed vigour with it too. Everything is looking positive, which is welcome.'
A source added: 'The King very much feels this is the second chapter of his reign and he is very positive about the future.'
The King's so-called first chapter of his refine has been defined by growing rifts within the between Charles and his son, Harry, and brother Andrew.
A palace insider claimed that the King wanted a better relationship with his youngest son but they said Charles was 'focussed on things he believes are more important right now.'
Meanwhile it has been previously reported that the King was said to be losing patience with his brother Prince Andrew over his continued refusal to leave Royal Lodge.
Charles has long been trying to get the Duke of York out of the 30-room, £30 million property in Windsor, which he lives in with his ex-wife Sarah Ferguson.
Andrew, 64, has insisted on staying in the mansion despite stepping down from official duties nearly five years ago.
The other major event of his reign so far was the King's surprise cancer diagnosis in February.
Through his treatment, the Monarch is to have taken 'great comfort and strength' from his family's love and support throughout.
The King and Queen are currently making their final preparations for their first international tour as Charles and Camilla prepare to head to Australia and the Commonwealth Heads of Government meeting in Samoa next month.
It was also recently announced that the Princess of Wales - who was also diagnosed with cancer this year - could be returning to public life very soon.
It is understood Kate could make an appearance at the Remembrance Day service this November and plans are also said to be already underway for her annual televised 'Together at Christmas' carol service at Westminster Abbey in December.