Irish police estimated 100,000 people turned out for the Easter Rising parade, which was the first for over 36 years and was attended by Irish President Mary McAleese and Prime Minister Bertie Ahern.
Around 900 guests -- half of them representatives of the families of those who died during the 1916 Rising -- joined Ms McAleese and Mr Ahern to review the parade at the General Post Office (GPO) in O'Connell Street in central Dublin.
The iconic GPO was the main building occupied by the insurgents around 90 years ago and was the headquarters for the uprising.
During the ceremonies at the GPO, an army officer read a copy of the Proclamation of a Republic and the national flag was lowered to half-mast.
A minute's silence was observed and wreaths were laid for all those who died, including rebels, British soldiers, police and civilians.
Sunday's march began at 12pm local time (11pm AEST) and took about an hour.
About 2,500 personnel from all sections of Ireland's defence and police forces took part in the parade.
Represented were the army, the Air Corps, the Naval Service, as well as members of the Irish UN, the veterans association, and the Organisation of Ex-Servicemen and Ex-Servicewomen.
It marked the biggest display of military pomp associated with 1916 commemorations since the 50th anniversary in 1966.
The April 24 to May 1, 1916 uprising ended in failure with an estimated 500 dead, 2,500 wounded and more than 2,000 imprisoned.
On April 24 that year, one of the Rising leaders, Patrick Pearse, read the proclamation of the sovereign rights of Irish people outside the GPO.
All seven signatories of the proclamation were tried by court-martial after they surrendered. They were executed by British forces.
Earlier, Prime Minister Ahern stressed inclusiveness and reconciliation when he began the day's ceremonies by laying a wreath in the Stonebreaker's Yard in Dublin's Kilmainham Jail, where most of the 1916 leaders were executed.
"Today is a day of remembrance, reconciliation and renewal," Mr Ahern said.
"As we look to the future, we must be generous and inclusive so that all of the people of Ireland can live together with each other and with our neighbours in Great Britain on a basis of friendship, respect, equality and partnership.
At the ceremony, Ahern was accompanied by Roman Catholic priest Father Joseph Mallin, 92, the only surviving child of any of the 1916 leaders, who had travelled from Hong Kong to take part.