An informal remembrance service has taken place at Leinster House to mark the centenary of the death of Arthur Griffith.

A signatory of the Anglo-Irish Treaty, Griffith died on 12 August 1922 aged just 51.

He has been remembered by Tánaiste and Fine Gael leader Leo Varadkar as "a leader of thought" and a founding father of the Irish State.

A number of low-key events are to take place over the coming days to mark the centenary, including a ceremony on the grounds of Griffith College and at Glasnevin Cemetery.

A wreath-laying ceremony has also taken place in the garden of Leinster House, attended by descendants of Mr Griffith.

The event was coordinated by Waterford TD Matt Shanahan.

Mr Shanahan said the event was being held to help ensure that recognition of Griffith's "legacy and sacrifice endures in the Ireland of tomorrow".

Griffith's death in 1922 was described as a "calamity for Ireland" by Michael Collins, who himself would be killed just a few days afterwards on 22 August.

Michael Collins and Arthur Griffith

Griffith's grandson Shane Gray said his grandfather was never going to be seen as a folk hero, unlike Collins.

"He lived very much in the shadow of Collins," he told RTÉ's Morning Ireland.

"Michael Collins, who was the hero and died heroically in battle, and so on. That charisma was not something Griffith had."

Mr Gray said his grandfather had many other attributes and worked hard all his life to achieve freedom for Ireland.

"Which we've been struggling for for 700 years, so he was never going to be commemorated as a folk hero, but he should be remembered."

Arthur Griffith and Éamon de Valera

Mr Gray said that while he never knew his grandfather, he did spend a lot of time with his grandmother, Maud Griffith.

He described her as a "feisty woman" who had strong views about the Civil War period and how Arthur was treated.

"He did die of stress and overwork, and that brought on the brain hemorrhage - as his doctor stated at the time," Mr Gray said.

He said his grandmother was not bitter, but certainly had strong views. She burned much of the papers and letters that would have been of interest to history researchers, he said.

"The name De Valera could never be mentioned in the house. He was just referred to as 'that long string of misery’, which I suppose wasn't totally inaccurate, but yes, through her I did learn some things, but she vowed pretty well never to speak about those awful times," Mr Gray said.