Castle Island, Lough Key, Roscommon
Discover the History of Castle Island
Located in the centre of Lough Key, Castle Island in County Roscommon is one of the most iconic and photographed landmarks in the County. Home to the famous McDermott’s Castle, the island is steeped in Irish mythology, medieval history, royal heritage, and folklore.
For centuries, Castle Island served as the stronghold of the MacDermot family, rulers of the ancient Kingdom of Moylurg. The MacDermots were one of the most powerful Gaelic clans in Connacht and played a major role in the history of the west of Ireland. The island’s strategic position in the middle of Lough Key made it both a defensive fortress and a symbol of power.
The earliest fortifications on the island date back to around the 12th century, although archaeological evidence suggests the site may have been occupied much earlier. Over time, the castle was expanded and rebuilt, creating the dramatic structure visitors see rising from the lake today.
The Legend of McDermott’s Castle
Castle Island is also famous for one of Ireland’s best-known romantic legends. According to local folklore, Úna Bhán, daughter of the MacDermot chief, fell in love with Tomás Láidir, a young man from a lower social class. Her family forbade the relationship and attempted to keep the couple apart.
Determined to reunite with Tomás, Úna Bhán escaped from the castle and attempted to swim across the waters of Lough Key. Tragically, she drowned before reaching the shore. Heartbroken, Tomás recovered her body and brought her back to Castle Island, where they were buried together.
The story of Úna Bhán and Tomás Láidir has become one of the great love stories of Irish folklore and continues to fascinate visitors exploring Lough Key today.
A Landmark in Irish History
Throughout medieval Ireland, Castle Island played an important role in regional conflicts and political power struggles. In 1235, Anglo-Norman forces attacked the island during invasions into Connacht. Despite repeated assaults over the centuries, the MacDermots retained control of the castle for generations.
In later centuries, parts of the castle were rebuilt and restored, particularly during the 19th century when the nearby Rockingham Estate developed the surrounding landscape and islands of Lough Key into a scenic estate.
Today, McDermott’s Castle remains one of the most recognisable castle ruins in Ireland and is a centrepiece of the breathtaking scenery surrounding Lough Key Forest Park.
Step into the legends of Ireland and experience the beauty of Castle Island with Lough Key Boat Tours.
Explore Castle Island by Boat
One of the best ways to experience Castle Island is from the water. Guided tours with Lough Key Boats allow visitors to get close to McDermott’s Castle while learning about the legends, history, and hidden stories of Lough Key.
From the lake, visitors enjoy spectacular views of:
- McDermott’s Castle
- Ancient wooded islands
- Historic monasteries and abbeys
- Wildlife and scenic landscapes
- The surrounding beauty of Lough Key Forest Park
Boat tours provide unique photo opportunities and an unforgettable way to experience one of Ireland’s hidden gems.
Plan Your Visit to Lough Key
Castle Island combines mythology, romance, history, and stunning scenery in one unforgettable location. Whether you are interested in Irish folklore, medieval castles, photography, heritage tourism, or simply exploring the natural beauty of Roscommon, Castle Island is one of the must-see attractions on Lough Key.
Popular with:
- Families
- History lovers
- Photographers
- Tourists exploring Ireland’s Hidden Heartlands
- Couples and romantic getaways
- Kayakers and boating enthusiasts
Castle Island remains one of the most magical and iconic locations in the west of Ireland.
Castle Island
Lough Key, Boyle, Co. Roscommon
Features in MOONE BOY
Moone Boy, the Emmy Award-winning TV series,
finds its esteemed residence in Boyle.
Moone Boy, the beloved TV series, found its captivating filming locations in the idyllic surroundings of Lough Key and the picturesque town of Boyle. The show’s production team discovered the enchanting beauty of Lough Key and decided it would be the perfect setting for some of the most memorable scenes in the series. With its tranquil waters and lush greenery, Lough Key provides a stunning backdrop that adds a touch of magic to the adventures of Martin Moone and his imaginary friend, Sean.
One notable feature of the show’s Lough Key scenes is the raft, a pivotal element created by Oliver Nevin of Lough Key Boats. This specially crafted raft becomes an integral part of Martin’s escapades, serving as a vessel for his imaginative journeys and bringing an element of whimsy to the show. Oliver Nevin’s craftsmanship and attention to detail in constructing the raft adds an authentic touch to the series, making the viewer feel fully immersed in Martin’s imaginative world.
As the story unfolds, the series also ventures into the charming town of Boyle, capturing its unique essence. Boyle’s quaint streets, historical buildings, and warm community atmosphere contribute to the overall charm of Moone Boy. Additionally, Boyle native and acclaimed actor Chris O’Dowd, known for his exceptional talent, brings an authentic connection to the show as he portrays the character of Martin’s father, providing a sense of familiarity and genuine representation of the town’s spirit.
With Lough Key’s ethereal beauty and the allure of Boyle’s vibrant community, Moone Boy succeeds in creating a truly enchanting and relatable world for its viewers. The combination of Chris O’Dowd’s portrayal, the captivating Lough Key scenes, and the contributions of local craftsmen like Oliver Nevin, elevates the series to a level of authenticity that resonates with audiences. Through this collaboration of talent and locations, Moone Boy captures the hearts of viewers, immersing them in a nostalgic and whimsical journey through the magic of Lough Key and the town of Boyle.
Frequently Asked Questions About Castle Island, Lough Key
Castle Island is a historic island located on Lough Key in County Roscommon. The island is best known for McDermott’s Castle, a medieval castle that once served as the stronghold of the MacDermot family.
McDermott’s Castle is located on a private island and cannot always be accessed directly by the public. However, visitors can enjoy spectacular close-up views of the castle from guided lake tours with Lough Key Boats.
The earliest structures on Castle Island are believed to date back to the 12th century, although the island may have been occupied even earlier. Parts of the castle were rebuilt and restored during the 19th century.
The MacDermots were a powerful Gaelic ruling family who controlled the ancient Kingdom of Moylurg in Connacht. Castle Island was their main stronghold for centuries.
According to Irish folklore, Úna Bhán, daughter of the MacDermot chief, fell in love with Tomás Láidir. Forbidden to be together, she attempted to swim across Lough Key to reach him but tragically drowned. The story has become one of Ireland’s most famous romantic legends.
Visitors on a boat tour can enjoy views of:
- McDermott’s Castle
- Historic islands and abbey ruins
- Scenic woodland landscapes
- Wildlife around the lake
- The beauty of Lough Key Forest Park
Guided tours also share the history, myths, and stories connected to the islands of Lough Key.
Castle Island is located in the centre of Lough Key in County Roscommon, Ireland, within the scenic surroundings of Lough Key Forest Park.
Yes, Castle Island is considered one of the top attractions in Roscommon and Ireland’s Hidden Heartlands. Its combination of medieval history, mythology, lake scenery, and iconic castle ruins makes it a must-see destination.
The best way to experience Castle Island is by water. Tours with Lough Key Boats provide unique views of the castle and surrounding islands while offering historical commentary and sightseeing experiences.
Yes, guided boat tours on Lough Key are suitable for families, couples, groups, and visitors of all ages looking to explore the history and scenery of the lake.
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