1 The capital of Ireland , Dublin is the center of the country's economy and culture . 1 Irish Dubh Linn , or Norse Dyfflin ( "Black Pool" ) , also called Baile Atha Cliath ( "Town of the Ford of the Hurdle" ) , city , formally a county borough , and capital of County Dublin and of Ireland . 1 The capital of Ireland , Dublin is the center of the country's economy and culture . 2 Located in the east-central part of the country at the head of Dublin Bay on the Irish Sea , the city is the country's chief port , centre of financial and commercial power , and seat of culture . 2 The city is located about halfway up the eastern coast of Ireland , at the head of Dublin Bay on the Irish Sea . 2 Located in the east-central part of the country at the head of Dublin Bay on the Irish Sea , the city is the country's chief port , centre of financial and commercial power , and seat of culture . 3 To the south are the Dublin and Wicklow mountains . 10 Each year the suburbs jut farther into the countryside , but to the south there is a natural limit posed by the Dublin and Wicklow mountains , which ring the city and provide some of its most beautiful urban vistas . 4 The River Liffey flows through the city and into the Irish Sea . 5 Situated at the head of a lovely bay , the city straddles the River Liffey where that stream flows eastward through a hill-ringed plain to the shores of the Irish Sea . 5 The city is named for the Gaelic phrase dubh linn , which means "black pool." 1 Irish Dubh Linn , or Norse Dyfflin ( "Black Pool" ) , also called Baile Atha Cliath ( "Town of the Ford of the Hurdle" ) , city , formally a county borough , and capital of County Dublin and of Ireland . 5 The city is named for the Gaelic phrase dubh linn , which means "black pool." 6 (The dark bog water made the "black pool" that gave the city its name . ) 6 Dublin is also Ireland's chief port . 2 Located in the east-central part of the country at the head of Dublin Bay on the Irish Sea , the city is the country's chief port , centre of financial and commercial power , and seat of culture . 9 The Four Courts , the seat of Ireland's judicial branch , and the Custom House are excellent examples of Dublin's late-18th-century architecture . 52 Along the quays of the River Liffey are Dublin's finest monumental buildings , the Neoclassical masterpieces of the Custom House ( 1781-91 ) to the south and the Four Courts ( 1786-1802 ) to the north . 10 The Custom House was burned in 1921 during Ireland's war of independence , and the Four Courts was destroyed in the civil war of 1922 . 54 The Custom House was burned in 1921 during the war of independence by republicans who wished to destroy British administrative records; the Four Courts was reduced by shellfire and mines at the outbreak of civil war in June 1922 . 11 However , both buildings have been rebuilt to look as they once did . 55 Both have since been rebuilt by the government with approximate authenticity but some loss of grace . 13 The English , who once ruled Ireland , used the castle as their headquarters until 1922 . 22 The castle , the seat of British authority in Ireland until 1922 , is now used for ceremonial occasions , especially the inauguration of the republic's presidents , who now reside at Aras an Uachtarain ( "The President's House," formerly the viceroy's lodge ) in Phoenix Park . 14 Today Ireland's presidents are sworn in there . 22 The castle , the seat of British authority in Ireland until 1922 , is now used for ceremonial occasions , especially the inauguration of the republic's presidents , who now reside at Aras an Uachtarain ( "The President's House," formerly the viceroy's lodge ) in Phoenix Park . 15 Near the castle are Christ Church and Saint Patrick's , two Protestant cathedrals . 23 Close to the castle a Viking king of Dublin built Christ Church Cathedral ( c . 19 It began as a wooden church in the 5th century and was rebuilt in the 12th century . 27 The Normans rebuilt it in 1191 , and it was enlarged and partially rebuilt over the centuries . 20 Both cathedrals were restored in the 19th century . 28 It was in a state of collapse when Sir Benjamin Lee Guinness , the brewing magnate and a lord mayor of Dublin , financed its restoration in the mid-19th century . 20 Both cathedrals were restored in the 19th century . 25 By the 19th century the edifice was in ramshackle condition; it was restored in the 1870s at enormous cost . 21 The country's two houses of Parliament meet in Leinster House , an 18th-century mansion . 42 Leinster House is now the seat of the Irish Parliament . 21 The country's two houses of Parliament meet in Leinster House , an 18th-century mansion . 99 The two houses of the Irish Parliament , the Dail and the Seanad ( Senate ) , meet at Leinster House in the centre of the city . 22 On either side of it are twin Victorian buildings , built in the late 19th century . 43 Twin Victorian buildings , which were constructed on either side of Leinster House in the 1880s , contain the National Library and National Museum of Ireland . 23 They house the National Library and National Museum of Ireland . 43 Twin Victorian buildings , which were constructed on either side of Leinster House in the 1880s , contain the National Library and National Museum of Ireland . 24 Just to the east is Merrion Square , and Fitzwilliam Square is to the south . 44 Merrion Square , immediately to the east , and Fitzwilliam Square , to the south , are two of the great 18th-century squares . 25 Saint Stephen's Green is the largest of the city's squares . 45 The oldest and largest of the city's squares is St . Stephen's Green , which was recorded in 1224 as common grazing land . 26 Dublin's Phoenix Park is one of the world's great city parks . 73 Dublin's Phoenix Park is one of the world's great city parks; it covers nearly 30 square miles ( 80 square kilometres ) on the north bank of the Liffey . 27 It covers nearly 1750 acres ( 700 hectares ) on the north bank of the Liffey . 73 Dublin's Phoenix Park is one of the world's great city parks; it covers nearly 30 square miles ( 80 square kilometres ) on the north bank of the Liffey . 28 In addition to a castle , lakes , and gardens , the park also has a zoo that is famous for breeding lions . 75 Its zoo , celebrated for lion breeding , opened in 1831 . 29 Trinity College was founded in 1592 and is Ireland's oldest university . 50 The University of Dublin ( Trinity College ) is Ireland's oldest university , founded in 1592 . 29 Trinity College was founded in 1592 and is Ireland's oldest university . 108 The oldest of Dublin's universities is Trinity College ( 1592 ) , the only college in the University of Dublin . 32 The National Theatre , which consists of the famous Abbey Theatre and the Peacock Theatre , opened in Dublin early in the 20th century . 116 Early in the 20th century the cultural renaissance gained strong momentum in Dublin with the opening of the famous Abbey Theatre , an enterprise associated particularly with the poet William Butler Yeats and the playwrights John Millington Synge and Lady Gregory . 33 It was founded in part by the poet and playwright William Butler Yeats . 116 Early in the 20th century the cultural renaissance gained strong momentum in Dublin with the opening of the famous Abbey Theatre , an enterprise associated particularly with the poet William Butler Yeats and the playwrights John Millington Synge and Lady Gregory . 34 The theater is associated with such well-known Irish writers as Yeats , John Millington Synge , and Sean O'Casey . 116 Early in the 20th century the cultural renaissance gained strong momentum in Dublin with the opening of the famous Abbey Theatre , an enterprise associated particularly with the poet William Butler Yeats and the playwrights John Millington Synge and Lady Gregory . 35 The old theater burned down in the early 1950s , and a new one opened in 1966 . 118 The old theatre burned down in the early 1950s , and with government help a new theatre was opened in 1966 housing both the main Abbey stage and the smaller , experimental Peacock Theatre . 39 As the financial center of Ireland , Dublin is the headquarters for the Irish Stock Exchange as well as many banks . 89 Dublin is the headquarters for Ireland's chief financial and commercial institutions . 43 Other industries include food products , electronics , pharmaceuticals , and chemicals . 88 Several industrial estates , however , have been built in the suburbs around the city and , with the help of government grants , have attracted new enterprises , notably electronics , chemicals , and engineering . 44 From ancient times people have lived in the area around Dublin Bay . 133 From prehistoric times people have dwelt in the area about Dublin Bay , and four of Ireland's five great roads converged near the spot called Baile Atha Cliath , the name stamped today on Dublin's postmark . 45 The first known settlement , however , was made by the Vikings in the 9th century AD . 137 The Vikings , or Norsemen , came in the 9th century ( c . 46 They fought off most attacks from local Irish groups , and their settlement prospered until 1170 . 141 The Viking invaders beat off most Irish attacks until 1014 , when they were defeated at the Battle of Clontarf on the north shore of the bay . 48 The Normans were subjects of King Henry II of England , and after the Vikings left Henry took control of Dublin . 145 Alarmed lest his Anglo-Norman vassals should claim Ireland for their own , King Henry II of England hurried over with an army to affirm his sovereignty . 52 At the end of the 17th century , the city began to grow as Protestants who were forced out of other countries moved to Dublin . 154 The city's remarkable resurgence began at the end of the 17th century , when thousands of refugee Huguenot weavers from France settled in Protestant Dublin after the revocation of the Edict of Nantes , in 1685 , curtailed their privileges . 53 Huguenots from France set up a profitable cloth weaving trade . 154 The city's remarkable resurgence began at the end of the 17th century , when thousands of refugee Huguenot weavers from France settled in Protestant Dublin after the revocation of the Edict of Nantes , in 1685 , curtailed their privileges . 54 During the 18th century , economic success led to further growth . 157 In the course of the 18th century , economic prosperity led to the development of Georgian Dublin . 55 New bridges were put up over the Liffey , and new suburbs arose outside of the city . 158 Development spread beyond the old medieval walls; more bridges were erected over the Liffey; and splendid new suburbs arose to the north and east . 56 Dublin soon became the second-largest city of the British Empire . 153 Yet , in the 18th century , Dublin was to become the second city of the British Empire . 57 In 1801 the Act of Union between England and Ireland created the United Kingdom of Great Britain and ended the Irish Parliament . 168 In 1801 the Act of Union between England and Ireland abolished the Irish Parliament and drastically reduced Dublin's status . 58 This greatly reduced Dublin's importance , and the city fell into a decline . 168 In 1801 the Act of Union between England and Ireland abolished the Irish Parliament and drastically reduced Dublin's status . 58 This greatly reduced Dublin's importance , and the city fell into a decline . 170 The city fell into a decline from which it recovered only 150 years later . 59 Then , in 1829 there was an end to laws that had taken away many civil rights from Catholics . 174 In 1829 the political dexterity of the Irish Catholic lawyer Daniel O'Connell achieved passage of the Emancipation Act , repealing the Penal Laws and enabling Catholics to sit once again in the British Parliament . 60 Catholic schools and universities were built , and the city elected a Catholic mayor . 175 After reforms in Dublin's municipal government , O'Connell became , in 1841 , the first Roman Catholic mayor of the city since the 17th century . 60 Catholic schools and universities were built , and the city elected a Catholic mayor . 176 For the first time in 200 years Roman Catholic churches and schools were built , and in 1854 the Catholic University of Ireland ( now University College Dublin ) opened on St . Stephen's Green , with John Henry Newman as rector . 61 Suburbs began to grow around the city when railways came to Dublin in 1834 . 177 The railways came to Ireland in 1834 , when a seven-mile link connected Dublin with the port of Kingstown ( now Dun Laoghaire) . 61 Suburbs began to grow around the city when railways came to Dublin in 1834 . 178 As a result , suburbs began to grow up along the coast to the south . 65 The Irish Free State was finally declared in 1921 . 197 A treaty was concluded in 1921 establishing the Irish Free State , but an antitreaty contingent of the republican army protested and took possession of the Four Courts building . 66 However , because there were people who were still loyal to England , the fighting continued until the early 1930s . 201 Political assassinations and armed raids continued until the early 1930s , and hostilities remained a marked feature of Dublin life . 68 After World War II ( 1939-45 ) , Dublin began again to spread into the surrounding countryside , and more suburbs developed . 210 After the war , as shortages eased , the city began again to spread into the surrounding countryside , and more suburbs took shape . 69 Tourism became an important part of the economy during this period . 214 Tourism became a major industry , and Ireland's membership in the EEC brought more political , economic , and cultural organizations to Dublin .