On an Easter Monday, April 24, 1916, a group of Irish nationalists proclaimed Ireland's Independence from the United Kingdom. The Irish Volunteers and Irish Citizen Army made a Proclamation and it was read out by Patrick Pearse outside the General Post Office on Sackville Street.
Though the Rising failed in military terms, the principles of the Proclamation to varying degrees influenced the thinking of later generations of Irish politicians.
Since the rising happened on an Easter day, it is called Easter Rising.
To commemorate 100th year of this event on January, 2016 An Post (Ireland Post) introduced 16 stamps under the 8th Definitive stamps series. The stamps have been grouped as Leaders and Icons, Participants, Easter week and the Aftermath.
These stamps features Augmented Reality, and when scanned by a smartphone with the CEE APP, will play the below video.
Disclaimer: I have compiled whatever I have read and understood through the Internet. If anything wrong please email me, I will make the changes.