The national flag of Ireland (Irish: bratach na hÉireann) is a vertical tricolour of green (at the hoist), white, and orange.
It is also known as the Irish tricolour. The flag proportion is 1:2 (length twice the width). Although the flag’s meaning is not covered by the Irish Constitution, the Irish government has stated that the green represents the Gaelic tradition of Ireland and the orange represents the followers of William of Orange in Ireland, with white representing peace, or a truce, between them.
Presented as a gift in 1848 to Thomas Francis Meagher from a small group of French women sympathetic to the Irish cause, it was not until the Easter Rising of 1916, when it was raised above the General Post Office in Dublin, that the tricolour came to be regarded as the national flag. Meagher was the son of Newfoundland-born mayor of Waterford, Thomas Meagher Jr, however there are two theories on his inspiration for the flag; the similarly-colouredNewfoundland Tricolour credited in legend as having been created in 1843, though this seems unlikely given the actual known history surrounding the Newfoundland Tricolour, and the French Tricolour.
The flag was adopted in 1919 by the Irish Republic during its war of independence, and subsequently by the Irish Free State (1922–1937), later being given constitutional status under the 1937 Constitution of Ireland. The tricolour is regarded by many nationalists as the national flag of the whole island of Ireland. Thus it is flown (often controversially) by many nationalists in Northern Ireland as well as by the Gaelic Athletic Association. It is similar to the flag of Côte d’Ivoire, but that flag is shorter and the colours are reversed. Wikipedia