In the 5th century, a simple wooden church was built at Mullaghbrack, within the remains of an ancient earthen-ringed fort. This church is associated with the
Culdee Priors of Armagh, who are sometimes regarded as "the successors of
St Patrick". The current
Church of Ireland church in Mullaghbrack, St. John's Church, was largely rebuilt in the 18th and 19th centuries on the site of an earlier structure. Among the earliest monuments in the church is a plaque dated to 1638. The area was impacted during the
Irish Rebellion of 1641. Irish commander
Féilim Ó Néill, on his march from
Newry to
Armagh in 1641, reputedly ordered Mulmory MacDonell "... to kill all the English and Scots within the parishes of Mullebrack, Logilly and Kilcluney". Among the properties destroyed in the Markethill area were the parish churches of Mullaghbrack and Kilcluney, Achesons Castle at Markethill and Hamilton's bawn. The rectors of Mullaghbrack (Reverend Mercer) and
Loughgilly (Reverend Burns) were both killed. ==Sport==