Two more Irish dioceses united ‘in persona episcopi’
Pope Leo XIV approved Bishop Gerard Nash to serve as bishop of both Ferns and Ossory, uniting them in persona episcopi. The union marks the first such arrangement in the Ecclesiastical Province of Dublin and expands a trend that began in the West of Ireland. Nash, 67, has been apostolic administrator of Ossory since Jan. 2026 and will oversee both dioceses while they remain juridically separate. The move continues a wave of similar appointments across Ireland, with previous unions in Tuam province and ongoing consolidations.
2 months ago
Two Irish dioceses—Ferns and Ossory—have been placed under the leadership of a single bishop, Bishop Gerard Nash, in an “in persona episcopi” arrangement approved by Pope Leo XIV. The move expands a restructuring trend that began in western Ireland and marks the first such union in the Dublin ecclesiastical province, bringing together more than 190,000 Catholics under one shepherd while the dioceses remain legally distinct. 1
Bishop Gerard Nash, who has headed the Diocese of Ferns since 2021, was appointed also as Bishop of Ossory on 29 July 2026. He will continue to serve as the apostolic administrator of Ossory, a role he has held since 25 January 2026. 1
The “in persona episcopi” model first appeared in Ireland’s western Province of Tuam in February 2022, when Bishop Michael Duignan took on the neighboring Diocese of Galway, Kilmacduagh, and Kilfenora. Subsequent unions involved Bishop Kevin Doran (Elphin and Achonry, 2025) and Archbishop Francis Duffy (Tuam and Killala, 2026). The Ferns‑Ossory pairing is the fourth such Irish set and the inaugural one outside the west. 1
In 2023 the Diocese of Ferns served about 110,593 Catholics, while Ossory ministered to roughly 81,832. Combined, Bishop Nash now oversees more than 192,000 faithful across the two jurisdictions. 1
Archbishop Dermot Farrell of Dublin welcomed the decision, noting that it allows both dioceses to retain their identities while sharing episcopal leadership and enabling new consultative structures. Some clergy and laity in Ossory expressed unease over the rapid turnover of bishops in recent years, marking Bishop Nash as the fourth bishop of that diocese in a decade. 1
The Vatican’s nuncio to Ireland, Archbishop Luis Mariano Montemayor, previously suggested that “in persona episcopi” unions could precede full mergers, a view echoed in ongoing consolidation discussions in England, Wales, and Scotland. Recent examples include the merger of Wales’s Cardiff and Menevia dioceses after an earlier “in persona episcopi” phase. 1
The Ferns‑Ossory union illustrates Pope Leo XIV’s broader strategy of streamlining diocesan structures to address clergy shortages, promote lay participation, and sustain sacramental life in regions with declining populations. It signals that the Irish Church’s restructuring is expanding beyond its western stronghold, potentially paving the way for further consolidations nationwide. 1*
Assess the canonical legitimacy of ‘in persona episcopi’ unions in Ireland
In general, in persona episcopi (one bishop governing two dioceses “in the person of” the same bishop) is a recognized canonical way of uniting dioceses while keeping them distinct—provided it is done by competent authority (the Holy See/Pope) and with the proper juridical form and purpose. However, a decisive judgment about the specific Irish cases requires the text(s) of the relevant apostolic decrees or constitutions, which are not included in the materials available here.
A useful canonical description appears in the tradition of how the Holy See can structure “union of dioceses.” The Catholic Encyclopedia describes “unio æque principalis” as a situation where multiple dioceses remain “in all other respects distinct,” yet are entrusted “for the purpose of administration to a single bishop.” In that model:
That pattern corresponds closely to what is commonly meant in Latin by an in persona episcopi arrangement: one bishop, two diocesan offices, with diocesan identity not absorbed into one.
By contrast, the same source also distinguishes unequal unions (e.g., a dependent diocese) and cases “per confusionem,” which involve deeper loss/change of rights rather than a merely administrative single-bishop governance model.
From the same canonical-historical description, the legitimacy of a diocese-union arrangement depends on at least these elements:
The Holy See (the Pope) is described as the one who makes/approves such unions, including by being influenced by advice and by issuing appropriate rules.
Moreover, later examples of diocesan unions in Acta Apostolicae Sedis show the Holy See using apostolic constitutions/decrees that explicitly decide the union and specify juridical consequences (e.g., how the episcopal curia and tribunals are handled; how clergy are incardinated into the union/new circumscription).
So, for Irish in persona episcopi unions to be canonically legitimate, the fundamental question is whether the arrangement is grounded in an explicit decree/constitution from competent authority, rather than being merely a pastoral convenience.
The same source states that unions of dioceses “ought to be justified by motives of public utility.”
Therefore, if an Irish in persona episcopi arrangement was established for a genuine pastoral-administrative good (e.g., resources, number of faithful, etc., as the source’s examples indicate), that supports legitimacy in principle.
If the arrangement is truly in persona episcopi / unio æque principalis, then the diocesan boundaries and institutional distinctness should remain as the model specifies (e.g., separate cathedral chapters and diocesan rights).
If, in practice, one diocese is treated as suppressed (or its juridical personality/rights are eliminated) without using the appropriate legal form of union/erection, that would not match the canonical logic described for unio æque principalis.
The Code’s general principle is that a diocese is a portion of the People of God limited to a territory, so that it includes all faithful living in that territory.
It also allows the erection of particular churches (in special circumstances) even within the same territory, when “in the judgment of the supreme authority of the Church” it seems advantageous after the relevant bishops’ conference has been heard.
While canon 372 does not directly legislate in persona episcopi, it reinforces that changes to diocesan structures belong to the supreme authority’s judgment and are tied to the juridical erection/definition of particular Churches.
A fully determinate canonical judgment about the Irish unions (e.g., “definitely valid” vs. “definitely invalid/illicit”) depends on the actual apostolic documents that erected/regulated the unions:
Those specifics are not present in the provided materials, so a definitive ruling “for Ireland” cannot be made here.
To evaluate a particular Irish in persona episcopi union canonically, the relevant apostolic act should be checked for:
On canonical principles, in persona episcopi unions are capable of canonical legitimacy when they are established by the Holy See as a form of union that preserves diocesan distinctness while placing administration under a single bishop, justified by public utility. However, a definitive legitimacy assessment for the particular Irish unions cannot be completed without the specific apostolic decree/constitution texts governing each case.