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National Data

Ireland Flag Ireland Flag
Country Ireland
Country code IE
City Dublin
Form of government Unitary Parliamentary Republic
Size in km² 68890
Population 4688465
Year of construction 1747


Type Horseshoe
Volume 41700
Architect Richard Cassels (DE)


Leinster House (Irish: Teach Laighean) is the seat of the Oireachtas, the national parliament of Ireland. Leinster House was originally the ducal palace of the Dukes of Leinster. Since 1922, it is a complex of buildings, of which the former ducal palace is the core, which house Oireachtas Éireann, its members and staff. The most recognisable part of the complex, and the "public face" of Leinster House, continues to be the former ducal palace at the core of the complex.

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IE Parliament


The home to Ireland’s bicameral parliament, also referred to as "Oireachtas", began as a private mansion. Upon the landlord’s ascent to a Duke of Leinster in 1776, the mansion was given the title "Leinster House". Before becoming the house of the legislature in 1922, the Royal Dublin Society used it as its headquarters, holding horse shows on the lawn which now hosts an obelisk, dedicated to the architects of Irish independence.

Facts & Figures

IE I16.png

Members of parliament 166 GPD per capita in PPP in US$ 48.755
Number of women 27 HDI 0,916
Pop. per MP 28.244 Democracy index 8,85
CO2 total 34.639 CO2 per capita 7,41


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Site Plan

Parliament overview


Collection Jörg Hempel: