The taking of the GPO 1916
Before reading the proclamation, Pearse and other Republican leaders seized the GPO and made it their military headquarters, flying the new flag of the republic from the flag-pole instead of the Union Flag. The green, white and orange tricolour was also flown on a lower flag-pole. The GPO, the Easter Proclamation and the tricolour (which later came to be seen as the flag of the republic, replacing the original green flag, which is now on display in the National Museum of Ireland) are the three most identifiable symbols of the Easter Rising, alongside the leaders, Padraig Pearse, James Connolly, Thomas Clarke, Thomas MacDonagh, Sean MacDermott, Joseph Plunkett & Eamonn Ceannt.