In 1663 Cornet Edward Cooper, who served under Cromwell when his army defeated the O'Brien Clan, was allotted the original 14th century Markree Castle and the surrounding lands. Until then, Markree had been a fortified outpost of the Irish McDonagh Clan, guarding the ford across the river Unsin.
Conor O'Brien died in this battle, and Edward married his widow Marie Rua (Red Mary). With her two sons they went to live at Dromoland Castle. One son, Donough, was left Dromoland and the other inherited Markree. Charles Cooper, the current owner, is a direct descendant of this son.
Times remained turbulent and during an attempt by the English King James to regain the throne, the Catholic army occupied Markree Castle and the Coopers had to flee. After the Battle of the Boyne in 1690, they returned and have been resident ever since except for a brief period during the Civil War in the 1920s when Markree was again occupied, this time by the Irish Free State army.
In 1830, Col. Edward Joshua Cooper MP (1798–1863) eldest son of Edward Synge Cooper MP, and Ann, daughter of Henry Vansittart, Governor of Bengal set up Markree Observatory in the castle grounds. For a number of years Cooper’s telescope was the largest in the world.
"The Observatory of Mr Cooper of Markree Castle – undoubtedly the most richly furnished private observatory known – is worked with great activity by Mr Cooper himself and by his very able assistant, Mr Andrew Graham." (Royal Astronomical Society, 1851)
The observatory remained active until the death of Edward Henry Cooper MP in 1902.
According to some sources  Cecil F. Alexander wrote her famous hymn, All Things Bright and Beautiful, while a guest there in 1848. The castle, as we see it today, dates from 1802 with exterior changes by the architect Francis Johnston and with some changes made, mainly to the interior, in 1896.
Ireland's lowest officially recognised air temperature, -19.1°C (−2.4°F), was measured at Markree Castle on 16 January 1881.
The soldier and politician Bryan Cooper inherited the castle on the death of his father in 1902 and resided there with his family (except during World War I and when carrying out political duties) from 1903 until his death in 1930.
After the Second World War the castle fell on hard times and stood empty and derelict for many years. In 1988 it appeared on the front cover of The Vanishing Country Houses of Ireland, a testament to the sad state of decay of many of Ireland’s great houses at the time until, in 1989, Charles Cooper transformed his ancestral castle into a hotel.
The castle today
Today, Markree Castle operates as a hotel run by Charles and Mary Cooper, the 10th generation of the family to live there.
The entrance contains a monumental staircase, which leads to a wonderful hall, from where a second staircase in carved wood leads to the 30 guest rooms. On the landing, a huge stained glass window traces the Cooper family tree from Victorian times back to the time of King John. The dining room is decorated in Louis Philippe-style plasterwork.
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