Cardinal Cahal Daly is being treated in the coronary care unit
The head of the Catholic church in Ireland has appealed for people to pray for his predecessor, who is seriously ill in hospital.
Cardinal Cahal Daly, 92, has been treated at the coronary care unit of Belfast City Hospital since Monday.
Cardinal Sean Brady visited Dr Daly and said that he was "being lovingly supported by his family and friends".
"At this time I ask Catholics to pray for Cardinal Daly, that he may be given all the graces that he needs," he said.
"While this is a sad time for all, we should be heartened and nourished by Cardinal Daly's motto which is Jesus Christ, yesterday and today (Hebrews 13:8).
"I know that throughout Ireland today people will be remembering Cardinal Daly in their prayers."
Born in Loughguile, County Antrim on 1 October, 1917 Cardinal Daly was Archbishop of Armagh and Primate of All Ireland in the early 1990s.
He was made a cardinal in 1991. He retired in 1996 at the age of 79 and returned to his study of philosophy.
Among his published works are Philosophy in Britain from Bradley to Wittgenstein and The Minding of Planet Earth, published in 2004.