"Since April 2008 I have been the key keeper for Newcastle in Bridgend, cared for by Cadw, the Welsh Assembly Government's historic environment service.
"Being a local boy, I've always been interested in the history of the town. In the past I've been involved with Ogmore and Coity castles and now I'm proud to be looking after Newcastle's heritage.
"As the Castle is free to visitors, one of my main tasks is ensuring the site is always well presented and looking its best for visitors.
"I enjoy the work and my responsibilities include checking the monument on a daily basis, opening and closing and keeping it free of litter every day.
"I also report any damage to Cadw and notify the police of any undesirable person or activities at the site. It is fair to say the site has a history of trouble with antisocial behaviour but after regular liaison with the police and the local community, things are much better now.
"Newcastle is in a very picturesque location overlooking the town of Bridgend and we have many local people and tourists visiting. It's a lovely spot to have a picnic and we also get a lot of newly married couples coming up here for their wedding photos.
"Coity Castle and Ogmore Castle are only a stone's throw away so tourists like to come and discover all three at the same time! It's great to be able to work outside, see who's around, meet new visitors and chat to interesting people who come here to have some quiet time and admire the wonderful view."
Established in the early 1100s by Robert FitzHamon, first Norman lord of Glamorgan, Newcastle overlooks the River Ogmore and town of Bridgend.
Like the neighbouring castles of Ogmore and Coity, Newcastle was initially constructed of earth and timber, being rebuilt in stone in the early 12th century.
In later years these great fortresses with curtain walls and towers of stone became the sheet anchors of conquest as native Welsh leaders found it increasingly difficult to reverse the overwhelming tide of the Norman advance.
The site appears to have been refortified by Henry II in the 1180s, as indicated by the exceptional quality of the masonry - its most outstanding feature is its complete Norman doorway.
Cadw have been so happy with Martin's work that in November 2008 they appointed him key keeper for nearby Ogmore Castle.
More about Ogmore Castle
Photos © Cadw Crown Copyright