Phoenix Park
Phoenix Park is an urban park
Urban park
An urban park, is also known as a municipal park or a public park, public open space or municipal gardens , is a park in cities and other incorporated places to offer recreation and green space to residents of, and visitors to, the municipality...

 in Dublin, Ireland
Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

, lying 2–4 km west of the city centre, north of the River Liffey
River Liffey
The Liffey is a river in Ireland, which flows through the centre of Dublin. Its major tributaries include the River Dodder, the River Poddle and the River Camac. The river supplies much of Dublin's water, and a range of recreational opportunities.-Name:The river was previously named An Ruirthech,...

. Its 16 km perimeter wall encloses 707 hectares (1,747 acre), one of the largest walled city parks in Europe. It includes large areas of grassland and tree-lined avenues, and since the seventeenth century has been home to a herd of wild Fallow deer
Fallow Deer
The Fallow Deer is a ruminant mammal belonging to the family Cervidae. This common species is native to western Eurasia, but has been introduced widely elsewhere. It often includes the rarer Persian Fallow Deer as a subspecies , while others treat it as an entirely different species The Fallow...

. The English name comes from the Irish fionn uisce meaning "clear water".
After the Normans
The Normans were the people who gave their name to Normandy, a region in northern France. They were descended from Norse Viking conquerors of the territory and the native population of Frankish and Gallo-Roman stock...

 conquered Dublin and its hinterland in the 12th century Hugh Tyrell, 1st Baron of Castleknock
Castleknock is a suburb of Dublin, Ireland. It is in the west of the modern administrative county of Fingal within the traditional county of Dublin. It is located west of the centre of Dublin....

, granted a large area of land, including what now comprises the Phoenix Park, to the Knights Hospitaller
Knights Hospitaller
The Sovereign Military Hospitaller Order of Saint John of Jerusalem of Rhodes and of Malta , also known as the Sovereign Military Order of Malta , Order of Malta or Knights of Malta, is a Roman Catholic lay religious order, traditionally of military, chivalrous, noble nature. It is the world's...