Catholic precedent for what many people call “ecumenical” saint veneration (i.e., honoring saints whose sanctity is recognized in more than one Christian tradition) rests on two connected facts: (1) early Christian communities already adopted saints from other local Churches into their calendars and martyrologies, and (2) the Church’s devotion to saints is doctrinally grounded and then regulated liturgically so that public veneration remains ecclesially trustworthy. 1 2 3 4

Historical development: saints’ cult began locally, but quickly crossed local boundaries

In the early centuries, veneration of saints did not begin as a purely “in-group” practice confined to one diocese. The liturgical cult of saints in both East and West had a twofold source: (a) the cult of martyrs, commemorated on the anniversary of their passion at or near their tombs, and (b) the memory of bishops, kept by the churches they had headed. 1 2

Crucially, each church had its own calendar, but those calendars were gradually enlarged—and not only by adding “new” local names. They were also enlarged by welcoming martyrs from other churches. In other words, the practice of honoring saints spread through a network of local Churches sharing liturgical memory. 1

The Directory on Popular Piety and the Liturgy explicitly describes how local observances (for martyrs’ passion anniversaries, bishops’ memorials, and other saintly commemorations) progressively developed into local calendars that preserved the date and place of death of saints (or groups of saints). 2

From local calendars to shared martyrologies: “borrowing” across Churches is documented

A major mechanism for this cross-pollination was the martyrology—a calendar-like “catalogue” arranged according to feasts.

A Catholic Encyclopedia article on Martyrology explains that, after commemorations began in a given Church, local lists were “little by little…enriched by names borrowed from neighboring Churches.” That is a direct historical description of ecumenically relevant behavior: saints’ names were integrated from other Christian communities into one’s own liturgical memory. 5

The same source adds that once the era of martyrs ended, the Church continued by introducing those who had shone in sanctity (including ascetics), showing continuity of the practice even as the historical category changed. 5

This wider sharing is also visible in the Church’s martyrology tradition itself: the Martyrologium Hieronymianum (6th century) is described as having chief sources including a general martyrology of the Churches of the East, alongside Roman and other Western materials. 5

Then, the Directory notes that the “martyrologies quickly evolved from the local calendars” and lists major martyrology lines (e.g., Syriac, Hieronymian, Bede, Lyons, Usuard, Adon). 2

Why this matters for “ecumenical” veneration

If a Church’s calendar is expanded by borrowed names from neighboring Churches and if its later martyrology compilation draws from Eastern and other sources, then Catholic history provides precedent for the legitimacy (at least historically) of honoring saints whose cult moves across ecclesial boundaries. 5 2 1

Doctrinal grounding: the Church’s veneration of saints is not merely cultural

Historical precedent alone could still be “accidental.” Catholic theology supplies the deeper rationale.

The Church’s teaching on saints’ veneration includes the honor of their sacred bodies and related memorials (relics). A doctrinal formulation in Denzinger’s Enchiridion Symbolorum (Dz 985) condemns those who deny that the holy bodies of saints (and martyrs and others living with Christ) “are to be venerated by the faithful,” while also condemning views that would treat such places dedicated to saints as visited in vain. 3

The Directory on Popular Piety and the Liturgy reiterates this in liturgical terms: it recalls the Second Vatican Council’s statement that “the Saints have been traditionally honoured in the Church, and their authentic relics and images held in veneration,” and it explains what “relics” primarily signify (bodies/notable parts) and also includes objects that belonged to saints or touched their bodies/tombs. 6

Even in scholastic theology, the Church distinguishes worship/adoration (latria) from the honor owed to saints and their relics. The discussion in Reordering Thomistic Josephology (summarizing St. Thomas’s reasoning) states that veneration of relics is due for reasons including that the saints’ souls now enjoy God and that God made the saints his ministers. 7

This doctrinal foundation helps clarify what “ecumenical” veneration is not: it is not worship owed to God alone, but rather a real cult of veneration directed to saints as members of Christ’s mystical body, rooted in the Church’s belief in their heavenly life. 3 6 7

Liturgical regulation: ecumenical openness is real, but public veneration is guarded

At the same time, Catholic history shows that devotion must be ecclesially authenticated—especially when it becomes a public cult.

A Catholic Encyclopedia entry on Acqui provides a concrete example. It states that veneration “from time immemorial” had existed, evidenced by statues and relics—but then “ceased since a decree of the Congregation of Rites (8 April, 1628) prohibited the veneration of saints whose sanctity had not been declared by the Holy See.” 4

This is significant for your question because it shows a historical balance:

• The Church historically allowed and even fostered cross-regional memory of saints (via calendars and martyrologies). 5 1 2
• Yet when it comes to public veneration, the Church historically required recognized sanctity (or at least suppression where it was not declared). 4

In the Directory’s framework, even when saints’ feasts are a “most eminent expression” of cult, the Church recognizes that fixing a day and harmonizing observances involves “various historical, liturgical, and cultic factors.” 2

What “precedent” looks like in practice: common ancient saints and shared memory

Putting these strands together, the Catholic precedent for “ecumenical saint veneration” typically takes one of two historical forms:

1. Shared early memory: Saints honored in local Churches that later became Catholic/Orthodox/other traditions’ common heritage—because early calendars were expanded by “martyrs from other churches” and by “names borrowed from neighboring Churches.” 1 5

2. Ecclesially governed adoption: Over time, compilations and official calendars increasingly standardized the Church’s public liturgical remembrance, drawing from multiple regions (including Eastern sources for later compilations), while still enforcing controls about which saints may receive public cult in particular ways. 5 2 4

Conclusion

Catholic historical precedent supports ecumenical saint veneration insofar as:

• The early Church’s calendars and martyrologies were not isolated: they were enlarged by martyrs from other churches and by names “borrowed from neighboring Churches.” 1 5
• The Church’s veneration of saints is doctrinally grounded (including relics and images), so cross-regional saints are not merely “local legends,” but can be honored as heavenly intercessors within Catholic teaching. 3 6
• Public veneration is regulated: history includes decrees suppressing cultus where sanctity was not declared by the Holy See, so “ecumenical” practice must align with ecclesial authentication. 4

In sum: Catholic precedent shows both a genuine historical openness to shared saintly memory and a necessary ecclesial discernment about how that memory is liturgically expressed. 5 2 4 6