Pope Benedict has appointed Monsignor Eamon Martin to succeed Cardinal Seán Brady as Archbishop of Armagh whenever he ceases to hold office.
The 52-year-old from Derry has been administrator of the Diocese of Derry since 2011.
The announcement was made this morning at St Patrick’s Cathedral in Armagh.
Cardinal Brady said he asked the Pope to appoint a Coadjutor to assist him in 2010.
He congratulated Monsignor Martin and welcomed him to the Diocese of Patrick.
Monsignor Martin was previously principal of St Columb's College in Derry and later became secretary of the Irish Episcopal Conference.
He was also Vicar General and more recently Apostolic Administrator of the Diocese of Derry.
Cardinal Brady described Monsignor Martin as a man of great gifts and great generosity who knows how to use those talents in the education of people, young and old.