Chi Rho

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This article is about the symbol. For the Japanese tank sometimes called Chi-Ro, see Type 89 I-Go. For the astrologer, see Cheiro.
The Chi-Rho symbol.

The Chi Rho (/ˈk ˈr/; also known as chrismon[1] is one of the earliest forms of christogram, and is used by some Christians. It is formed by superimposing the first two (capital) letters chi and rho (ΧΡ) of the Greek word "ΧΡΙΣΤΟΣ" = KHRistos = Christ in such a way to produce the monogram.[2] Although not technically a Christian cross, the Chi-Rho invokes the authority of Jesus, as well as symbolising his status as the Jewish Messiah called Christ.[3]

The Chi-Rho symbol was also used by pagan Greek scribes to mark, in the margin, a particularly valuable or relevant passage; the combined letters Chi and Rho standing for chrēston, meaning "good."[4] Some coins of Ptolemy III Euergetes (r. 246–222 BC) were marked with a Chi-Rho.[5]

The Chi-Rho symbol was used by the Roman emperor Constantine I (r. 306–337) as part of a military standard (vexillum). Constantine's standard was known as the Labarum. Early symbols similar to the Chi Rho were the Staurogram (Christliche Symbolik (Menzel) I 193 2.jpg) and the IX monogram (Christliche Symbolik (Menzel) I 193 4.jpg).

The Chi Rho symbol has two Unicode codepoints: U+2627 CHI RHO in the Miscellaneous Symbols block and U+2CE9 COPTIC SYMBOL KHI RO in the Coptic block.

Origin and adoption[edit]

Missorium depicting Emperor Constantine's son Constantius II accompanied by a guardsman with the Chi-Rho depicted on his shield (at left, behind the horse).

According to Lactantius,[6] a Latin historian of North African origins saved from poverty by the Emperor Constantine I (r. 306–337), who made him tutor to his son Crispus, Constantine had dreamt of being ordered to put a "heavenly divine symbol" (Latin: coeleste signum dei) on the shields of his soldiers. The description of the actual symbol chosen by Emperor Constantine the next morning, as reported by Lactantius, is not very clear: it closely resembles a Chi-Rho or a staurogram, a similar Christian symbol. That very day Constantine's army fought the forces of Maxentius and won the Battle of the Milvian Bridge (312), outside Rome.

Emperor Constantine's labarum, a standard incorporating the wreathed Chi-Rho, from an antique silver medal.

Eusebius of Caesarea (died in 339) gave two different accounts of the events. In his church history, written shortly after the battle, when Eusebius didn't yet have any contact with Constantine, he doesn't mention any dream or vision, but compares the defeat of Maxentius (drowned in the Tiber) to that of the biblical pharaoh and credits Constantine's victory to divine protection.

In a memoir of the Roman emperor that Eusebius wrote after Constantine's death (On the Life of Constantine, circa 337–339), a miraculous appearance came in Gaul long before the Battle of the Milvian Bridge. In this later version, the Roman emperor had been pondering the misfortunes that befall commanders that invoke the help of many different gods, and decided to seek divine aid in the forthcoming battle from the One God. At noon, Constantine saw a cross of light imposed over the sun. Attached to it, in Greek characters, was the saying "Τούτῳ Νίκα!".[7] Not only Constantine, but the whole army saw the miracle. That night, Christ appeared to the Roman emperor in a dream and told him to make a replica of the sign he had seen in the sky, which would be a sure defence in battle.

Eusebius wrote in the Vita that Constantine himself had told him this story "and confirmed it with oaths" late in life "when I was deemed worthy of his acquaintance and company." "Indeed", says Eusebius, "had anyone else told this story, it would not have been easy to accept it."

Eusebius also left a description of the labarum, the military standard which incorporated the Chi-Rho sign, used by Emperor Constantine in his later wars against Licinius.[8]

Later usage[edit]

Late antiquity[edit]

The so-called "Chrismon of Saint Ambrose" (Chrismon Sancti Ambrosii), on display on the eastern wall of Milan Cathedral, a Chi-Rho combined with Alpha and Omega in a circle. According to Landulf of Milan (12th century), it was used by Saint Ambrose to introduce the catechumens to the mysteries of the Christian faith (whence it was called "oracle" or chresmos of St. Ambrose, written by Landulf as crismon, whence the later New Latin term for the Chi-Rho symbol).[9]

An early visual representation of the connection between the Crucifixion of Jesus and his triumphal resurrection, seen in the 4th century sarcophagus of Domitilla in Rome, the use of a wreath around the Chi-Rho symbolizes the victory of the Resurrection over death.[10]

After Constantine, the Chi-Rho became part of the official imperial insignia. Archaeologists have uncovered evidence demonstrating that the Chi-Rho was emblazoned on the helmets of some Late Roman soldiers. Coins and medallions minted during Emperor Constantine's reign also bore the Chi-Rho. By the year 350, the Chi-Rho began to be used on Christian sarcophagi and frescoes. The usurper Magnentius appears to have been the first to use the Chi-Rho monogram flanked by Alpha and Omega, on the reverse of some coins minted in 353.[11] In Roman Britannia, a tesselated mosaic pavement was uncovered at Hinton St. Mary, Dorset, in 1963. On stylistic grounds, it is dated to the 4th century; its central roundel represents a beardless male head and bust draped in a pallium in front of the Chi-Rho symbol, flanked by pomegranates, symbols of eternal life. Another Romano-British Chi-Rho, in fresco, was found at the site of a villa at Lullingstone (illustrated). The symbol was also found on Late Roman Christian signet rings in Britain.[12]

Insular Gospel books[edit]

In Insular Gospel books the beginning of Matthew 1:18, at the end of his account of the genealogy of Christ and introducing his account of the life, so representing the moment of the Incarnation of Christ, was usually marked with a heavily decorated page, where the letters of the first word "Christi" are abbreviated and written in Greek as "XPI", and often almost submerged by decoration.[13] Though the letters are written one after the other and the "X" and "P" not combined in a monogram, these are known as Chi-Rho pages. Famous examples are in the Book of Kells and Book of Lindisfarne.[14] The "X" was regarded as the crux decussata, a symbol of the cross; this idea is found in the works of Isidore of Seville and other patristic and Early Medieval writers.[15] The Book of Kells has a second Chi-Rho abbreviation on folio 124 in the account of the Crucifixion of Christ,[16] and in some manuscripts the Chi-Rho occurs at the beginning of Matthew rather than mid-text at Matthew 1:18. In some other works like the Carolingian Godescalc Evangelistary, "XPS" in sequential letters, representing "Christus" is given a prominent place.[17]


See also[edit]



  1. ^ From a supposed Middle Latin crismon, specifically applied to the "Chrismon of Saint Ambrose" in Milan Cathedral. Crismon (par les Bénédictins de St. Maur, 1733–1736), in: du Cange, et al., Glossarium mediae et infimae latinitatis, ed. augm., Niort: L. Favre, 1883‑1887, t. 2, col. 621b. "CRISMON, Nota quæ in libro ex voluntate uniuscujusque ad aliquid notandum ponitur. Papias in MS. Bituric. Crismon vel Chrismon proprie est Monogramma Christi sic expressum ☧"; 1 chrismon (par les Bénédictins de St. Maur, 1733–1736), in: du Cange, et al., Glossarium mediae et infimae latinitatis, ed. augm., Niort : L. Favre, 1883‑1887, t. 2, col. 318c.
  2. ^ Steffler 2002, p. 66.
  3. ^ Spink & Son 1979, p. 4: "These quotations are very significant. They indicate that at the time we are speaking of, c. 350, the chi-rho was not merely a Christian symbol, but more specifically the symbol of the risen ever living Christ."
  4. ^ Southern 2001, p. 281; Grant 1998, p. 142.
  5. ^ von Reden 2007, p. 69: "The chi-rho series of Euergetes' reign had been the most extensive series of bronze coins ever minted, comprising eight denominations from 1 chalkous to 4 obols."
  6. ^ Lactantius. On the Deaths of the Persecutors, Chapter 44.
  7. ^ The well known sentence In hoc signo vinces is simply a later Latin translation of Eusebius's Greek wording.
  8. ^ Eusebius Pamphilius: Church History, Life of Constantine, Oration in Praise of Constantine, Chapter 31.
  9. ^ Kenelm Henry Digby, Mores Catholici, Or, Ages of Faith vol. 1 (1844), p. 300. A. L. Millin, Voyage dans le Milanais (1817), p. 51.
  10. ^ Harries 2004, p. 8. Sarcophagus with Scenes of the Passion (probably from the Catacomb of Domitilla), Rome, mid-fourth century. Marble, 23ʺ x 80ʺ. Museo Pio Christiano, Vatican, Rome.
  11. ^ Kellner 1968, p. 57ff. See also Grigg 1977, p. 469 (Note #4).
  12. ^ Johns 1996, p. 67.
  13. ^ In the Latin Vulgate the verse was "Christi autem generatio sic erat cum esset desponsata mater eius Maria Ioseph antequam convenirent inventa est in utero habens de Spiritu Sancto" ("Now the birth of Jesus Christ took place in this way. When his mother Mary had been betrothed to Joseph, before they came together she was found to be with child from the Holy Spirit")
  14. ^ Lewis 1980, pp. 142–143.
  15. ^ Lewis 1980, pp. 143–144.
  16. ^ Lewis 1980, p. 144.
  17. ^ Lewis 1980, p. 153.


Further reading[edit]