The Prince of Wales and Duchess of Cornwall have visited the Senghenydd mining memorial on the fourth day of their Summer tour.
Prince Charles laid a wreath at the Welsh National Mining Memorial at the site.
439 miners and a rescuer died during an explosion at the Universal Colliery in Senghenydd in 1913.
The couple went on to open the newly re-located Aber Valley Heritage Museum before attending separate engagements in Usk.
The Prince of Wales and the Duchess of Cornwall will pay tribute to Wales' coal mining and farming past as they continue their summer tour.
It's the fourth day of their visit. Senghenydd and Usk are on their itinerary.
The Royal couple will lay a wreath at the Welsh National Mining Memorial in Senghenydd, which was unveiled last year.
The Duchess of Cornwall will also tour a number of locations in Usk to celebrate the 50th anniversary of the 'Britain in Bloom' competition, now run by the Royal Horticultural Society.
Despite the fact that Usk only has a population of c.2000, it has around 90 clubs and societies.
Some focus their efforts on making the town look its best through the RHS Britain in Bloom campaign.
The town's competition effort is paid for from public fundraising.
A portrait of the Duke of Cambridge, painted by Welsh artist Dan Llywelyn Hall, has been officially unveiled at the Welsh Office in Westminster this afternoon.
The painting of Prince William, entitled Fatherhood, will be auctioned off to the public later this year.
All proceeds will go to charity.
"The image was based on a formal meeting with the Duke of Cambridge when he came to visit my portrait 'The Queen', which was unveiled at the Millennium Stadium last year" said Mr Llywelyn Hall.
"It was him looking over towards the portrait, which was in the lobby above the players' tunnel in the Millennium Stadium."
"Some notion of sort of destiny.... and I liked that as an image in itself."
A new portrait of Prince William by a Welsh artist will be revealed at the Welsh Office in Westminster later today.
The painting, entitled "Fatherhood" is by Dan Llywelyn Hall who has experience painting royals - his portrait of the Queen which was commissioned by the Welsh Rugby Union was unveiled in Cardiff last year.
His latest work will depict the Duke of Cambridge wearing a dark suit and a red tie with a poppy in his lapel.
The portrait will then be open to public bidding at the First World War Centenary Sale auction in October - with all proceeds going to The Victoria Cross Trust and the War Memorial Trust.
Despite the heat Prince Charles was the King of Cool as he met children in Llantwit Major today.
He, along with the Duchess of Cornwall, were in the Vale of Glamorgan on day two of their summer tour.
Megan Boot went along too...
Prince Charles and the Duchess of Cornwall are continuing their annual summer tour of Wales.
The Royal couple visited Dyffryn House and Gardens in the Vale of Glamorgan.
They then went onto the newly-restored Gaililee Chapel in Llantwit Major, where they met members of the local community.
Celebrating Welsh heritage is the key theme of the Prince of Wales' second day of his annual summer visit to Wales.
The Prince and the Duchess of Cornwall will begin the day seeing the newly-restored Galilee Chapel in Llantwit Major, which holds one of the most important collections of Celtic Christian stones in the UK.
From there, the Prince and the Duchess will visit to Dyffryn House and Gardens, a fine example of an Edwardian mansion and designed gardens.
In the afternoon, while the Duchess visits the Welsh War Memorial in Cardiff, Prince Charles will tour Sony's Bridgend factory, which has generated hundreds of jobs for the local area over the past 40 years.
Just twenty four hours after Prince Charles was accused of trying to influence government policy, he's begun his summer tour of Wales.
The Prince was said to have tried to change policies both in Westminster and with the Welsh Government.
Today the politics were replaced by promotion as he visited family-owned businesses in West Wales.
Alexandra Lodge reports from Carmarthenshire
Prince Charles has visited the Cnwd Food factory in Carmarthenshire.
During the tour of the site - which describes itself as a 'small gourmet food business', the Prince was shown how to fillet and smoke a fish.
Today sees the start of the Prince of Wales and Duchess of Cornwall's annual summer tour of Wales.
They are visiting three family businesses in Carmarthenshire and Pembrokeshire.