The park was formerly the estate of the Gregory family. Coole House was built in the late 18th century for Robert Gregory: a three-storey house with a square porch and as principal rooms a dining room and drawing-room with bay windows facing out to Coole Lough and the Burren Hills, and a library in between them. In 1880, Robert's great-grandson, William Henry Gregory married Isabella Augusta Persse, who became Lady Gregory. The death in World War I of their only child, Robert, a pilot in the Royal Flying Corps, inspired the poet W B Yeats to write works which included "An Irish Airman Foresees His Death." The walled garden contains an autograph tree, a copper beech that is engraved with initials of many of the leading figures of the Irish Literary Revival who were personal friends of Lady Gregory including Yeats, Edward Martyn, George Bernard Shaw, John Millington Synge and Seán O'Casey. Yeats' poem The Wild Swans at Coole was inspired by the beauty of the swans in the turlough at Coole Park. Yeats's home at Thoor Ballylee was just 3 miles away; he also wrote "Coole Park, 1929", a poem that describes the park as a symbol for the revival of Irish literature: "Here traveller, scholar, poet, take your stand, / When all these rooms and passages are gone / When nettles wave upon a shapeless mound / And saplings root among the broken stone." Coole House may have been damaged in the Irish Civil War. Lady Gregory sold the estate to the Irish state in 1927, but retained life tenancy. She died in 1932 and the furnishings were soon auctioned off. By the 1960s the state had allowed the Gregorys' former house to fall into a ruin, a neglect deplored by Micheál Mac Liammóir in 1964. Indeed, according to the National Archives, the building was actively demolished by the state in 1941. Today, all that remains is the plinth on which it stood.
Today
The grounds are open to the public all year round. A visitor centre located in the former outbuildings operates during high season. The centre offers a tea room, an audio/visual presentation on Lady Gregory and the literary history of Coole Park, and also a multi-media exhibition called "Coole Park through the eyes of 'Me and Nu', Granddaughters of Lady Gregory". In 2014, disease forced the felling of many trees in Coole Park for safety reasons, as confirmed by the National Parks and Wildlife Service.
Ecology
The ephemeral nature of turlough hydrology gives rise to a characteristic ecology. Turloughs have been designated as a Priority Habitat in the EU Habitats Directive. Coole Park is part of the Coole-Garryland Complex, a candidate Special Area of Conservation. Since 1990 Coole Lough & Garryland Wood has been protected as a Wetland of International Importance under the Ramsar Convention.
Protection for birds
A wildfowl sanctuary, where the shooting of game birds is not permitted, is designated under the Wildlife Act 1976. The park is included in a Special Protection Area for birds under the EU Birds Directive: this site of 520 ha was designated in 1996 because of its importance for wintering waterfowl, notably whooper swan. The SPA overlaps with a smaller Important Bird Area, Coole Park and Garryland complex.
