There had long been Gaelic settlements in this area. Archaeological evidence has been found in the village of a Gaelic ringfort. In the early 17th century, Bellaghy became one of many towns planned, built and settled under the authority of the Vintners Company of London, as part of the English Plantation of Ulster. In 1622, according to a manuscript of a Captain Thomas Ash, Bellaghy consisted of a church, a castle, a corn mill and twelve houses. During the Plantation, English colonials built a fortified house in the village. It had surrounding walls and two circular towers at opposite corners. This is the best-restored example of a fortified house to be found anywhere in Northern Ireland. Recent excavations have revealed that the fortified house was built on the site of a former Gaelic ringfort. During the 1641 rebellionthe house was attacked by Irish rebels, but it remained intact. Many other houses in the village were burnt to the ground. Locally it was called "The Castle" and is located on Castle Street. The refurbished house was opened to the public in 1996 as "Bellaghy Bawn". It is a museum featuring exhibitions on local history. In May 1922, during the Irish War of Independence, the Irish Republican Army launched an attack on Bellaghy Royal Irish Constabulary barracks, killing an RIC officer and wounding three others. An IRA volunteer was also killed and three captured.
People
, who became a Nobel Prize-winning poet, was born as the eldest of nine children at Mossbawn, his family's farm in Bellaghy. He later lived in Dublin but is buried in the graveyard of St Mary's Catholic Church, Bellaghy. The village has an arts centre dedicated to him, known as the Seamus Heaney HomePlace. The centre features talks, poetry readings, and performances. It has exhibits of photographs, texts, and poems to show the influence of place on his language. Others to hail from the village include World Outdoor Bowls champion Margaret Johnston, computer engineer Fred Kennedy - who made an important contribution to the Apollo 11 moon landing - and international footballer Sarah McFadden. Two Bellaghy natives, Francis Hughes and his cousin Thomas McElwee, died participating in the 1981 Irish hunger strike during the Troubles. They were protesting at the treatment by the British and supporting political change in Northern Ireland. Other republicans from Bellaghy include former Irish National Liberation Army leader Dominic McGlinchey, his wife Mary and his son Declan who died of a heart attack. Jack McErlean is another notable character from Bellaghy, he was the Commander of the Bellaghy Street Elite for many years before going on to study a Masters of Engineering in Electronic Engineering at Ulster University.
2001 Census
Bellaghy is classified as a Village by the , i.e. with population between 1,000 and 2,250 people. On Census day, there were 1,063 people living in Bellaghy. Of these:
31.4% were aged under 16 years and 12.7% were aged 60 and over
49.9% of the population were male and 50.1% were female
86.0% were from a Catholic background and 14.0% were from a Protestant background