On April 24, 1916, a flag with the inscription ‘Irish Republic’ was hoisted alongside the Irish tricolour over the General Post Office, Dublin during the 1916 Easter Rising as a proclamation of the Irish Republic. A photograph was taken of it flying on the south-eastern corner of the GPO by a guest staying in the Metropole Hotel. "It remained on the roof throughout the week, survived the bombardment and the fire which destroyed the G.P.O and was eventually removed by the troops after the insurgents’ surrender, either on Sunday, 30 April or on the following day. A photograph taken at the time shows a group of soldiers holding it upside down at the base of Parnell monument in O’Connell Street. Thereafter, it was placed in the Imperial War Museum, London. It was presented by the British government to the Irish government on the fiftieth anniversary of the rising in 1966".
The flag features a green field with the inscription "Irish Republic" written in white and yellow (gold) letters in the form of Gaelic script. It measures 4 feet 3 inches by 5 feet 6 inches and is now on display at the National Museum of Ireland – Decorative Arts and History.