More than 1,500 people packed St John's Cathedral in Limerick for the ordination of Fr Brendan Leahy as the 47th Bishop of Limerick, and the first to be ordained since 1974.
Limerick had been without a bishop since 2009 when Dr Donal Murray resigned following criticism of him in the Murphy Report.
Addressing the audience, which included his 91-year-old father Maurice, the newly ordained Bishop Leahy said that he and all in the diocese are at the beginning of a new chapter in which there is a need to reach out to the marginalised in society.
Dublin-born Bishop Leahy said he was struck by the words of Pope Francis when he advised to "start from the outskirts" when reaching out to people.
The new bishop also quoted from U2's 'I Still Haven't Found What I'm Looking For', which he said could apply to the situation of many with regard to faith.
Bishop Leahy also spoke of the Catholic Church's need to seek forgiveness for its own sins.
"Darkness in our faith journey can affect us individually but also as a group, as a community, as a church. We know only too well of how many innocent people suffer terrible darkness because of clerical abuse. I want to make their pain my own and seek forgiveness," he said.