Subsequently, the centre of the diocese was located at Ferns due to the influence of Diarmaid mac Murchadha.

[citation needed] It comprised roughly the ancient territory of the Uí Cheinnselaig with the bishop's seat (cathedra) located at Ferns Cathedral.

During the later medieval period the church at New Ross enjoyed quasi-cathedral status.

[4][5] In the Roman Catholic Church, the bishopric of Ferns continues as a separate title.

[6][7] The current Incumbent is the Most Reverend Gerard Nash, Bishop of the Roman Catholic Diocese of Ferns, who was appointed by the Holy See on 11 June 2021 and was ordained bishop on 5 September 2021.