* Members of the Cwmwed Ial group battle it out.
Between 11am and 4pm each day the group will be living life as it was at around the time that Castell Dinas Brân was built.
Visitors can find out about the sort of things they ate, their clothes, healing and warfare as well as watch set piece battles on the hillside.
"It will really bring the Castle to life," said county archaeologist Fiona Gale.
"Castell Dinas Brân was built in the 13thcentury by the local Welsh princes and was a very grand home as well as strong fortification. Cwmwd Iâl will fire up our imagination and gives us an idea of day to day life for the people of the castle."
Denbighshire Countryside staff will be on hand as well.
A modern marquee will have fun children’s activities and information about the local area, part of the Clwydian Range and Dee Valley Area of Outstanding Natural Beauty and close to a World Heritage Site.
There will be walks up to the Castle from The Pancake throughout the day (12 noon, 2pm and 4pm) to find out about the history and biodiversity of the castle itself and to look at the work that has gone on to ensure the castle remains standing and easy to access….at least as easy as it can be on top of a steep hill!
The best way to see the re-enactors is to park in Llangollen and walk up from the town.
The way will have extra signage for the weekend to help you get there.
Or you could use the Llangollen Lift at 10 am and 1 pm from Parade Street in town.
Ros Stockdale, regional routes warden, said: "It will take you to the Eglwyseg side of the Castle, then you can walk around the castle, which is a pleasant walk of about three quarters of a mile through woodland - and best of all, relatively flat!"
For further information contact Denbighshire Countryside Staff on O1352 810614 or 01978 869615.