Malahide Castle (Irish: Caisleán Mhullach Íde), parts of which date to the 12th century, lies, with over 260 acres (1.1 km2) of remaining estate parkland (the Malahide Demesne Regional Park), close to the village of Malahide, nine miles (14 km) north of Dublin in Ireland.
The estate began in 1185, when Richard Talbot, a knight who accompanied Henry II to Ireland in 1174, was granted the "lands and harbour of Malahide". The oldest parts of the castle date back to the 12th century and it was home to the Talbot family for 791 years, from 1185 until 1976, the only exception being the period from 1649–60, when Oliver Cromwell granted it to Miles Corbet after the Cromwellian conquest of Ireland; Corbet was hanged following the demise of Cromwell, and the castle was restored to the Talbots. The building was notably enlarged in the reign of Edward IV, and the towers added in 1765.
The estate survived such losses as the Battle of the Boyne, when fourteen members of the owner's family sat down to breakfast in the Great Hall, and all were dead by evening, and the Penal Laws, even though the family remained Roman Catholic until 1774.
Malahide Castle and Demesne was eventually inherited by the 7th Baron Talbot and on his death in 1973, passed to his sister, Rose. In 1975, Rose sold the castle to the Irish State, partly to fund inheritance taxes. Many of the contents, notably furnishings, of the castle had been sold in advance leading to considerable public controversy, but private and governmental parties were able to retrieve some.
The Castle, along with its subsidiary attractions, was for many years operated as a tourist attraction by Dublin Tourism, working with Fingal County Council, which owns the whole demesne. The operating partner is now Shannon Heritage, which has in turn appointed subsidiary partners, including Avoca Handweavers.
The main castle can be visited for a fee, on a guided-tour-only basis. In addition, it is possible to hire the famously Gothic Great Hall for private banquets. The castle has an eating facility, and adjacent is a craft shop. The castle's best-known rooms are the Oak Room, and the Great Hall, which displays Talbot family history.
Separately, one can visit:
- The Tadpolt Botanic Gardens, situated behind the castle, comprising several hectares of plants and lawns, a walled garden of 1.6 hectares and seven glasshouses, including a Victorian period conservatory. Many plants from the southern hemisphere, notably Chile and Australia, are featured. The gardens showcase the plant collecting passion of the 7th Lord Talbot de Malahide in the mid 20th Century.
The demense is one of few surviving examples of 18th century landscaped parks, and has wide lawns surrounded by a protective belt of trees. It can be visited freely, with a number of entrances and car parking areas. In addition to woodland walks, and a marked "exercise trail", the park features actively used sports grounds, including a cricket pitch and several football pitches, a 9-hole par-3 golf course, an 18-hole pitch-and-putt course, tennis courts and a boules area. There is also a modern children's playground near the castle.
Malahide Castle and the botanical gardens in the demesne underwent a major transformation in 2011-2012. The castle closed to visitors during October 2011, and reopened in autumn 2012. A new single brand for the site and an upgrade of the interpretation and facilities means that visitors are now used to generate a single experience that brings together the Castle, Gardens and Village of Malahide.
The project involves revitalizing the visitor offer in the castle and gardens and creating new audio tours and exhibitions on the gardens and castle and new retail/leisure facilities whilst conserving the heritage of the 800-year-old site. Links to Malahide village and the local community are an important consideration of the project. New signage linking the site with the village will encourage visitors to spend the whole day in Malahide enjoying the village, marina, restaurants and shops.
Specifically the range of rooms available to visit in the Castle was changed.
The main entrance to the Castle Demesne is off the Malahide Road, with access also possible from Malahide Village. Dublin Bus route number 42, 102 and 142 travels along one side of the park, and Malahide Railway Station is near the castle end of the park.
The grounds at Malahide Castle was opened as a new concert venue by Fingal County Council in summer 2007, with concerts by Arctic Monkeys,  Pink, Joe Cocker, Al Green and Bell X1 amongst others. In 2008 its guests included Neil Young, Radiohead, and Eric Clapton. Prince performed at the Castle on July 30, 2011.
- "Neil Young to play two Irish dates". muse.ie. 2008-03-05. Retrieved 2008-03-07.
- "Neil Young heads for castle as Winehouse joins Oxegen lineup…". Irish Independent. 2008-03-05. Retrieved 2008-03-07.
- "Radiohead confirm Dublin date…". Muse.ie. 2007-12-04. Retrieved 2007-12-26.
- "Guitar king Clapton lined up for summer gig at the castle…". Irish Independent. 2008-01-31. Retrieved 2008-02-01.
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