The Prince of Wales will head to Mallwyd as part of a tour of Wales to mark the 50th anniversary of his investiture next week.

On Friday July 5, Charles will visit Mallwyd Church in Machynlleth to listen to a traditional Welsh Plygain choral service, after an engagement at Trawsfynydd in Gwynedd to see Yr Ysgwrn, home of the celebrated Welsh war poet Hedd Wyn who was killed on the first day of the Battle of Passchendaele.

Heir to the throne Charles was formally invested with his title by the Queen on July 1 1969 at Caernarfon Castle when he was 20-years-old.

The prince will be spending the week in Wales with the Duchess of Cornwall, touring the country, as they carry out more than 20 engagements over five days.

Other engagements will bring back memories for the prince, who will be revisiting some of the places he travelled to in 1969.

But he will not be returning to Caenarfon Castle - the scene of the grand ceremony, staged amid great pomp and ceremony 50 years ago.

A Clarence House spokesman said: "Since the Prince of Wales's investiture in 1969, His Royal Highness has taken great pride and joy in supporting the many charities and organisations which do vital work in Wales for its communities and for the preservation and promotion of Welsh life and culture.

"This year's annual visit will also give His Royal Highness the opportunity to revisit some of the places the prince visited 50 years ago, including Swansea and The Morriston Tabernacle Chapel."

Camilla, president of Maggie's, will visit the charity's first cancer care centre in Whitchurch, Cardiff.

Charles and Camilla will be staying at their Welsh home Llwynywermod in Llandovery in Camarthenshire for the week.

The couple will also host a music and drama evening there, featuring performances by the tenor Wynne Evans, and announce the new Royal Harpist.

Charles's investiture was televised and watched by an audience of 19 million people in the UK, and millions more worldwide.

Princess Margaret's then husband the Earl of Snowdon was responsible for the design of the ceremony at the castle in north Wales.

A fresh-faced Charles - who is now the longest-serving Prince of Wales and heir apparent - knelt before the Queen to receive the insignia of office and pledge allegiance.

Charles was created the Prince of Wales by his mother when he was nine-years-old on July 26 1958.

The visit by the prince and the duchess will be their 15th annual summer visit to Wales, Clarence House said.