Pope Leo strengthens Roman Curia with new appointments in key Vatican dicasteries
Pope Leo XIV appointed Bishop Marco Mellino as secretary of the Dicastery for Legislative Texts, effective Sept. 1. He named Father Lucio Adrián Ruiz as secretary of the Dicastery for the Service of Charity and layman Massimo Ralli as its undersecretary. The appointments follow earlier changes to the Roman Curia’s leadership, including prefects Archbishop Anthony Randazzo and Archbishop Luis Marín de San Martín. They underscore the Pope’s focus on strengthening the Vatican’s administrative and charitable functions through new officials in key dicasteries.
3 months ago
Pope Leo XIV has reshaped the leadership of the Roman Curia, appointing new secretaries and under‑secretaries in two key dicasteries and expanding the membership of the Dicastery for Evangelization. 1
Bishop Marco Mellino (59) was named secretary of the Dicastery for Legislative Texts, moving from his role as adjunct secretary. He previously served as secretary of Pope Francis’ Council of Cardinals, worked in the Secretariat of State, and chaired the Interdicasterial Commission for revising the Curia’s General Regulations. 1
Father Lucio Adrián Ruiz, an Argentine priest with a background in communications, technology, and business administration, was appointed secretary of the Dicastery for the Service of Charity. He had been secretary of the Dicastery for Communication and held senior positions in Vatican Internet Services and the Pontifical University of the Holy Cross. 2
Layman Massimo Ralli, formerly an official in the charity dicastery, will serve as its under‑secretary. Both Ralli and Ruiz will assume their duties on 1 September. 1
The secretarial role is the second‑most senior position in a dicastery, responsible for day‑to‑day operations and technical coordination. These appointments follow Pope Leo’s earlier selections of prefects earlier in the year: Archbishop Anthony Randazzo for Legislative Texts and Archbishop Luis Marín de San Martín as papal almoner heading the Service of Charity. 2
In parallel moves, Pope Leo has appointed two women to head major dicasteries:
These appointments mark a continued emphasis on inclusive leadership within the Curia. 1 2
On 30 June, Pope Leo added a broad slate of new members and consultors to the Dicastery for Evangelization’s Section for First Evangelization and New Particular Churches, underscoring its global missionary mandate. Notable additions include:
Consultors appointed include Archbishops Davide Carbonaro (Italy) and François Sylla (Guinea), as well as priests Remigio Bellizio, Joseph Koonamparampil, and Wenceslaus C. Madu. 1 2
These moves collectively reinforce Pope Leo XIV’s strategy of revitalizing the Curia’s administrative core, promoting diverse geographic representation, and advancing the Church’s evangelizing mission.*
Examine how Curial appointments shape Catholic doctrinal governance
Curial appointments shape Catholic doctrinal governance primarily by determining who exercises the Church’s doctrinal “care” organs (especially within the Roman Curia) and how consistently those organs act in communion with the Roman Pontiff. Because the Curia is explicitly instrumental and vicarious—acting “in his name and by his authority”—appointments do not create new doctrine on their own, but they powerfully affect how doctrine is studied, proposed, protected, examined, and applied across the Catholic world.
The Roman Curia exists to help the Pope govern the universal Church, and canon law states that it performs its function “in his name and by his authority” for the good and service of the churches.
This matters for doctrinal governance: personnel changes matter, but not in the sense of autonomous doctrinal rule-making by the Curia. The Curia’s character is defined as instrumental/ministerial and therefore dependent on the Petrine ministry. John Paul II explains that the Curia’s departments “act in his name and by his authority,” and exist in relation to the Pope’s ministry.
Pope Francis’ Praedicate Evangelium emphasizes the same logic through its “vicarious nature”: each institution carries out its mission by the power received from the Roman Pontiff, operating with vicarious power in exercising the Pope’s primatial office.
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Praedicate Evangelium specifies that curial institution members are appointed from among:
Doctrinal governance is therefore affected at the level of competence and viewpoint:
Appointments are not permanent. The Pope appoints key officials and consultative personnel for a five-year term.
Also:
This establishes doctrinal governance through measured continuity with planned renewal:
Moreover, Praedicate Evangelium provides a general rule that after five years, curial clerical officials and members of religious institutes/societies should return to their dioceses or institutes, with possible extension if appropriate. That helps ensure Curial doctrinal governance stays connected to lived pastoral reality, not only to internal bureaucracy.
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Within the Curia’s doctrinal care functions, Fidem servare describes a Doctrinal Section/Office whose responsibilities include promoting and protecting doctrine of faith and morals, encouraging study for understanding/transmission of the faith, and using “light of faith” as a criterion for questions posed by science and societal development.
Crucially, it explains that for matters of faith and morals the Section:
So doctrinal governance is not only “teaching” in the abstract; it is process-governed:
Curial appointments affect how each of those steps is performed—especially:
Fidem servare also states that the Section studies issues relating to Personal Ordinariates established by Anglicanorum Coetibus, and that it has a Matrimonial Office to examine, in law and in fact, matters concerning the privilegium fidei.
This means appointments can shape doctrinal governance in very concrete domains:
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The Congregation for the Doctrine of the Faith (CDF) is a prime example of how doctrinal governance is structured by institutional purpose. The document To promote and safeguard the faith explains that, along with its name, the Congregation’s functions changed: rather than prosecuting heresies and suppressing offenses, its purpose became to promote and safeguard the faith.
It further states that, confirmed in Pastor Bonus, the CDF’s role includes encouraging studies that help respond in the light of faith to new problems emerging from science and civilization, and assisting bishops in their primary role as authoritative teachers and doctors of the faith.
This mission-shift implies a further way appointments shape governance:
The same source describes how the CDF carries out its mandate by seeking to prevent harm from errors disseminated in writing; it ensures writings are subject to prior examination by competent authority, and if something is determined contrary to Church teaching, the author is given opportunity to explain and then appropriate remedies follow.
Thus, doctrinal governance depends not only on doctrine itself, but on appointed officials who:
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Because the Pope appoints senior officials and consultors (for set terms), and because the Curia operates by power received from him, curial appointments are a governance mechanism ensuring doctrinal coherence with the Pope’s magisterial and prudential aims.
Praedicate Evangelium describes tasks of the Secretariat of State’s Section for General Affairs, including preparing documents concerning appointments made or approved by the Roman Pontiff involving prefects (or equivalents), members, secretaries, undersecretaries, and consultors of curial institutions, as well as documentation connected to institutions dependent on the Holy See or associated with it.
This is not doctrinal content itself, but it is doctrinal governance infrastructure:
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The CDF’s mission includes assisting bishops, individually and in episcopal groups, in their role as authoritative teachers and doctors of the faith, to which bishops themselves must bear witness and remain vigilant custodians and promoters.
Therefore, Curial appointments affect doctrinal governance not only “in Rome,” but through:
Because the Curia is a servant instrument of the Petrine ministry and of bishops’ teaching mission, staffing changes in doctrinal dicasteries can shift the practical support bishops receive: which studies are encouraged, how dialogue is structured, and how remedies or doctrinal clarifications are pursued in response to new challenges.
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Curial appointments shape Catholic doctrinal governance in a distinct way: they select the personnel who run the doctrinal offices and procedures that promote and safeguard faith and morals, examine problematic writings, coordinate doctrinal reviews across dicasteries, and support bishops as authentic teachers.
At the same time, doctrinal governance is not rewritten by appointment: the Curia is explicitly ministerial and vicarious, operating with power received from the Roman Pontiff and acting in his name and authority. Appointments therefore primarily affect implementation—the Church’s doctrinal governance style, competence, priorities, and procedural execution—within the boundaries of papal communion and revealed truth.