Blue plaque to Daniel O'Connell in Albemarle Street, London

Prof Martin Daunton of English Heritage said O'Connell was arguably the Mandela or Mahatma Gandhi of his age

Irish political giant Daniel O'Connell has been remembered as the Nelson Mandela of his day, as the newest of London's blue plaques was unveiled in his honour.

The commemoration to O'Connell stands in Albemarle Street.

The Kerry man was known as The Liberator for his battle for the right of Catholics to sit in the British Parliament.

The plaque marks his former home in the capital's Mayfair district.

Among those already honoured by the blue plates in London are John Lennon, Florence Nightingale, Charles Dickens, Karl Marx and Jimi Hendrix.

Outside the house, Prof Martin Daunton of English Heritage, which issues the honours, said O'Connell was arguably the Mandela or Mahatma Gandhi of his age.

"His campaign for Catholic emancipation and his principled opposition to slavery was - and still is - admired around the world," he said.

"We are delighted to honour this towering figure in the city which formed the backdrop for much of his career."

O'Connell lived at 14 Albemarle Street from February 1833 for up to six months, during a significant time for the groundbreaking 19th century politician.

During that year's general election, 39 of his supporters in the campaign against the Act of Union were elected to the House of Commons.

The plaque was unveiled at the house after O'Connell's descendants proposed the idea to a panel of judges at English Heritage.

'Prophet of a coming time'

At the official unveiling, Geoffrey O'Connell, his great-great-grandson, said they were delighted to see the commemoration in a city that did much to shape his beliefs and ideals.

"The 'prophet of a coming time' was how the future British prime minister William Gladstone described O'Connell and his peaceful struggle for universal rights for people of all races and creeds is as pertinent today as it was prescient then," he said.

The plaque has been erected in Albemarle Street where O'Connell lived for a time in the 1830s

A four-storey terraced house dating from the 18th century, the property has been converted into apartments and a retail outlet, squeezed between designer shops.

Blue plaques are granted to historical figures who lived in London for a significant time and who are deemed eminent and exceptional in terms of their public and national recognition.

O'Connell regularly visited and lived in London after fleeing revolutionary France for the city in 1793 to study as a barrister.

After taking his parliamentary seat in 1830 as the first popularly elected Catholic MP since the Reformation, he sat in the Commons for the rest of his life and was a major force in Westminster.

Irish Arts Minister Jimmy Deenihan and Ireland's ambassador to Britain Dan Mulhall were among those at the unveiling.

The plaque's inscription includes O'Connell's popular sobriquet, The Liberator.

Other Irish luminaries commemorated with an English Heritage blue plaque include Ernest Shackleton, Bram Stoker, Oscar Wilde and WB Yeats.