President Michael D Higgins has led the commemoration ceremony at the GPO in Dublin to mark the anniversary of the 1916 Easter Rising.
The 1916 Proclamation of Independence was read by Captain Conor Gibbons, as it was by Pádraig Pearse 109 years ago.
President Higgins was joined by Taoiseach Micheál Martin and Tánaiste and Minister for Defence Simon Harris for the proceedings.
Former President Mary Robinson and Northern Ireland First Minister Michelle O'Neill were among those attending the ceremony.
President Higgins laid a wreath outside the GPO to commemorate those who died before a minute's silence was observed.
There were more than 160 Defence Forces personnel taking part in the event.
Defence Forces' brass, reed and pipe bands played during the commemoration.
Inspired for a 'better, fairer future'
Speaking ahead of the event, President Higgins said the men and women who participated in the 1916 Rising were "inspired by the declaration of a Republic, and the dream of a better, fairer future".
"The Proclamation of the Republic, which Patrick Pearse read out from under the portico of the GPO, offers elements of a generous social and political vision that can still inspire us," he said.
"We are challenged by their message to address the issues of global poverty, the consequences of climate change, the conflict in so many places of the world that threaten the lives of civilians, and the erosion of basic rights," President Higgins added.
Lord Mayor of Dublin Emma Blain, who also participated in the event, said the ceremony "serves as a solemn reminder of our shared history and the enduring values enshrined in the Proclamation".
"It also provides us the opportunity to reflect on the sacrifices made for our freedom and to renew our commitment to building a society that cherishes all its citizens equally," she added.
The Easter Rising took place mostly in Dublin between Monday 24 April and Saturday 29 April of Easter week in 1916.
The armed insurrection was organised by the Irish Republican Brotherhood, whose members included Pearse, James Connolly, Tom Clarke and Seán Mac Diarmada.
A number of groups, including the Irish Volunteers, under the leadership of Pearse, the Irish Citizen Army, led by Connolly, and the Irish republican women's group Cumann na mBan, would partake in the fighting.
Several key buildings around the city were seized by the rebels, including the GPO, the most famous location associated with the Rising.
It was heavily shelled, with the interior destroyed by fire.
While the main facade escaped serious damage, some bullet holes are still visible today in the six pillars at the front of the building.
McDonald reiterates a call for Irish unification
Elsewhere, Sinn Féin leader Mary Lou McDonald has reiterated a call for Irish unification as senior members of her party attended events to commemorate the Easter Rising.
Ms McDonald addressed the annual commemoration in Carrickmore, Co Tyrone.
She told those gathered that "building a new and united Ireland is the most important task for a generation" and that the party was "intent to finish the business of 1916".
Ms McDonald said: "Here we stand for the day when we will commemorate our patriots in a united and free Ireland.
"So, let's work day and night to fulfil the dream of Connolly and Pearse, of Hurson and Farrell, of McGuinness and O'Hare."
She added: "Hold tightly to your hopes, to your beliefs, to your determination.
"Never, ever give up.
"We will see the rising of the moon.
"We will unite Ireland, we will build a society where workers and families come first, and together we will achieve the Republic of 1916."
Additional reporting Harry Manning
