The shamrock is a pretty bad analogy for the Trinity. In fact, it's somewhat of a heretical explanation if one puts much emphasis on it. It's partialism:

St. Patrick's Bad Analogies (YouTube)

So, that in itself is good evidence that St. Patrick wouldn't (or shouldn't) have used the shamrock to teach the Trinity. And Wikipedia provides some evidence that he didn't:

The first written mention of the link does not appear until 1681, in the account of Thomas Dineley, an English traveller to Ireland. Dineley writes: The 17th day of March yeerly is St Patricks, an immoveable feast, when ye Irish of all stations and condicions were crosses in their hatts, some of pinns, some of green ribbon, and the vulgar superstitiously wear shamroges, 3 leav'd grass, which they likewise eat (they say) to cause a sweet breath.

It goes on:

There is nothing in Dineley's account of the legend of St. Patrick using the shamrock to teach the mystery of the Holy Trinity, and this story does not appear in writing anywhere until a 1726 work by the botanist Caleb Threlkeld. Threlkeld identifies the shamrock as White Field Clover (Trifolium pratense album ) and comments rather acerbically on the custom of wearing the shamrock on St. Patrick's Day

So, what do we have stronger evidence for? Did St. Patrick actually use the shamrock as an analogy to teach the Trinity?

If so, do we know what sort of emphasis or seriousness he placed on the analogy?


3 Answers 3


As far as we know, he did not use this analogy. It does not appear in the extant writings attributed to him, nor in early hagiographies. There are several places in these documents where a shamrock metaphor wouldn't go completely amiss, and yet it doesn't seem to appear anywhere.

In the Confession attributed to Patrick, he talks a lot about how he is a simple unlearned person, who has nevertheless managed to convert a large number of people. That might suggest use of easily-understandable metaphors rather than very precise theological statements. On the other hand, there are biographies that say he studied under Saints Germanus of Auxerre and Martin of Tours, received large numbers of books from Pope Celestine I, and so forth, suggesting that he might have understated his level of education. His reported speech is generally quite direct and Biblical - more of a "repent, ye sinners" flavour than any kind of gentle analogy.

Given the complete lack of reference until the eighteenth century, it seems more likely that the explanation was associated with him long after he actually lived, than that it was somehow preserved in tradition for the whole time, without appearing in any of the many written sources about this popular saint.

I'll now give some examples of shamrocks not appearing. There is a fifth-century poem or hymn attributed to him, called the Lorica of St. Patrick (Luireach Phadraig) or Deer's Cry (Faeth Fiada), which invokes the Trinity but does not use an analogy. The ninth century hagiography known as the Tripartite Life (Bethu Phátraic) recounts an episode where Patrick converts the two daughters of Lóegaire mac Néill, saying in response to their question about what kind of God he worships:

St. Patrick, full of the Holy Spirit, responded, "Our God is the God of all, the God of heaven and earth, the God of the seas and rivers, the God of the sun and moon, and all the other planets; the God of the high hills and low valleys; God over heaven, in heaven, and under heaven; and He has a mansion, that is, heaven, and the earth, and the sea, and all things that are in them. He inspireth all things. He quickeneth all things. He enkindleth all things. He giveth light to the sun, and to the moon. He created fountains in the dry land, and placed dry islands in the sea, and stars to minister to the greater lights. He hath a Son, coeternal and coequal with Himself; and the Son is not younger than the Father, nor is the Father older than the Son. And the Holy Ghost breatheth in them. And the Father, and the Son, and the Holy Ghost are not divided. I desire, moreover, to unite you to the Son of the heavenly king, for ye are daughters of an earthly king." 1

This would be the perfect time to mention the shamrock, but it does not appear. The same goes for the seventh-century Life by Muirchú moccu Machtheni, and the other sources. It is frequently mentioned that people in Ireland did not generally know about or believe in the Trinity before Patrick, and that he baptized people in the name of the Trinity, but there is no record of him using any metaphor for it, shamrock or otherwise, when he baptized or taught.

Tertullian's work Against Praxeas (Adversus Praxeam) uses a plant metaphor for the Trinity (chapter 8). Here, he says that the three persons of the Trinity are like the root, trunk, and fruit of the tree. This has something of a similar character to the shamrock metaphor, though the three parts for Tertullian have distinct roles2, and the clover leaves are all the same. It is possible that Patrick had some exposure to this idea, or independently reinvented it. But there is absolutely no evidence.

1. From the translation by James O'Leary, 1874. Original Latin and Irish text is on lines 1124-1138 of Kathleen Mulchrone's 1939 edition.
2. Partialism!? Modalism?! Perhaps. Metaphors are hard.


Why does everyone keep missing the obvious? The early Celtic people were used to triad Gods and Goddesses as most of their Druidic deities had triple personas. Check it out! Further, they were taught that all things in nature came in threes like birth, life and death and sea, earth and sky. They were no strangers to the belief that three was a definition of oneness. Patrick didn't need a shamrock to explain the Trinity. In later generations, after the Druidic belief in threes as sacred phenomena had been forgotten, the monks began to use the shamrock as a poor visible example of the three in one explanation and that is why you will find no mention of the use of the shamrock in text until many centuries after Patrick's death!

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    – agarza
    Commented Mar 25, 2021 at 3:31
  • How do you know this? Can you please edit it to add some evidence?
    – curiousdannii
    Commented Mar 25, 2021 at 6:34

Not only didn't Patrick use a shamrock to explain the Trinity, he didn't even believe in the Trinity.

Let's start with what most people think they know. We have been told that Patrick was a Catholic monk who brought the Trinity doctrine to the people of Ireland. And along the way he drove all the snakes from the Emerald Isle. He became so renowned that the Catholic Church made him a "saint." None of that is true!
Who Was "Saint Patrick"? Should a Christian Observe Saint Patrick's Day? | United Church of God

I don't want to reproduce the entire article here, but its section headings are:

  • Patrick was Scottish!
  • Patrick did not follow Roman Catholic doctrine
  • Patrick observed the Saturday Sabbath, Passover and rejected the Trinity doctrine
  • Is Saint Patrick's Day in the Bible?
  • That article has no sourcing. And I've never before heard that Patrick was Scottish. English or Welsh are common suggestions. Certainly Romano-British, and the Romans never made much headway in Scotland.
    – TRiG
    Commented Jul 24, 2023 at 13:16
  • @TRiG has "never before heard that Patrick was Scottish". CATHOLIC ENCYCLOPEDIA: St. Patrick says "Apostle of Ireland, born at Kilpatrick, near Dumbarton, in Scotland … In his sixteenth year, Patrick was carried off into captivity by Irish marauders and was sold as a slave". Commented Jul 24, 2023 at 16:03

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