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A History of the Christian Altar
The Christian altar consists of an elevated surface, tabular in form, on which the Sacrifice of the Mass is offered. The earliest Scripture reference to the altar is in St. Paul (I Cor. x, 21); the Apostle contrasts the "table of the Lord" (trapeza Kyriou) on which the Eucharist is offered, with the "table of devils", or pagan altars. Trapeza continued to be the favourite term for altar among the Greek Fathers and in Greek liturgies, either used alone or with the addition of such reverential qualifying terms as iera, mystike, The Epistle to the Hebrews (13:10) refers to the Christian altar as thysiasterion, the word by which the Septuagint alludes to Noah's altar. This term occurs in several of the Epistles of St. Ignatius (Ad Eph. v; Magnes. iv, 7; Philad. 4), as well as in the writings of a number of fourth and fifth century Fathers and historians; Eusebius employs it to describe the altar of the great church at Tyre (Hist. Eccl., X, iv, 44). Trapeza, however, was the term most frequently in use. The word bomos to designate an altar. was carefully avoided by the Christians of the first age, because of its pagan associations; it is first used by Synesius, Bishop of Cyrene, a writer of the early fifth century. The terms altare, mensa, ara, altarium, with or without a genitive addition (as mensa Domini), are employed by the Latin fathers to designate an altar. Ara, however, is more commonly applied to pagan altars, though Tertullian speaks of the Christian altar as ara Dei. But St. Cyprian makes a sharp distinction between ara and altare, pagan altars being aras diaboli, while the Christian altar is altare Dei [quasi post aras diaboli accedere ad altare Dei fas sit (Ep. lxv, ed. Hartel, II, 722; P. L., Ep. lxiv, IV, 389)]. Altare was the word most commonly used for altar, and was equivalent to the Greek trapeza.
I. MATERIAL AND FORM
The earliest Christian altars were of wood, and identical in form with the ordinary house tables. The tables represented in the Eucharistic frescoes of the catacombs enable us to obtain an idea of their appearance. The most ancient, as well as the most remarkable, of these frescoes, that of the Fractio Panis found in the Capella Greca, which dates from the first decades of the second century, shows seven persons seated on a semi-circular divan before a table of the same form. Tabular-shaped altars of wood continued in use till well on in the Middle Ages. St. Athanasius speaks of a wooden altar which was burned by the Count Heraclius (Athan. ad Mon., lvi), and St. Augustine relates that the Donatists tore apart a wooden altar under which the orthodox Bishop Maximianus had taken refuge (Ep. clxxxv, ch. vii, P. L., XXXIII, 805). The first legislation against such altars dates from the year 517, when the Council of Epaon, in Gaul, forbade the consecration of any but stone Altars (Mansi, Coll. Conc., VIII, 562). But this prohibition concerned only a small part of the Christian world, and for several centuries afterwards altars of wood were used, until the growing preference for altars of more durable material finally supplanted them. The two table altars preserved in the churches of St. John Lateran and St. Pudentiana are the only ancient altars of wood that have been preserved. According to a local tradition, St. Peter offered the Holy Sacrifice on each, but the evidence for this is not convincing. The earliest stone altars were the tombs of the martyrs interred in the Roman Catacombs. The practice of celebrating Mass on the tombs of martyrs can be traced with a large degree of probability to the first quarter of the second century. The Fractio Panis fresco of the Capella Greca, which belongs to this period is located in the apse directly above a small cavity which Wilpert supposes (Fractio Panis, 18) to have contained the relics of a martyr, and it is highly probable that the stone covering this tomb served as an altar. But the celebration of the Eucharist on the tombs of martyrs in the Catacombs was, even in the first age, the exception rather than the rule. (See ARCOSOLIUM) The regular Sunday services were held in the private houses which were the churches of the period. Nevertheless. the idea of the stone altar, the use of which afterwards became universal in the West, is evidently derived from the custom of celebrating the anniversaries and other feasts in honour of those who died for the Faith. Probably, the custom itself was suggested by the message in the Apocalypse (vi, 9) "I saw under the altar the souls of them that were slain for the word of God." With the age of peace, and especially under the pontificate of Pope Damasus (366-384), basilicas and chapels were erected in Rome and elsewhere in honour of the most famous martyrs, and the altars, when at all possible, were located directly above their tombs. The "Liber Pontificalis" attributes to Pope Felix I (269-274) a decree to the effect that Mass should be celebrated on the tombs of the martyrs (constituit supra memorias martyrum missas celebrare, "Lib. Pont.", ed. Duchesne, I, 158). However this may be, it is clear from the testimony of this authority that the custom alluded to was regarded at the beginning of the sixth century as very ancient (op. cit., loc. cit., note 2). For the fourth century we have abundant testimony, literary and monumental. The altars of the basilicas of St. Peter and St. Paul, erected by Constantine, were directly above the Apostles' tombs. Speaking of St. Hippolytus, the poet Prudentius refers to the altar above his tomb as follows:
Talibus Hippolyei corpus mandatur opertis
Propter ubi apposita est ara dicata Deo.
Finally, the translation of the bodies of the martyrs Sts. Gervasius and Protasius by St. Ambrose to the Ambrosian basilica in Milan is an evidence that the practice of offering the Holy Sacrifice on the tombs of martyrs was long established. The great veneration in which the martyrs were held from the fourth century had considerable influence in effecting two changes of importance with regard to altars. The stone slab enclosing the martyr's grave suggested the stone altar, and the presence of the martyr's relics beneath the altar was responsible for the tomblike under-structure known as the confessio. The use of stone altars in the East in the fourth century is attested by St. Gregory of Nyssa (P. G., XLVI, 581) and St. John Chrysostom (Hom. in I Cor., xx); and in the West, from the sixth century, the sentiment in favour of their exclusive use is indicated by the Decree of the Council of Epaon alluded to above. Yet even in the West wooden altars existed as late as the reign of Charlemagne, as we infer from a capitulary of this emperor forbidding the celebration of Mass except on stone tables consecrated by the bishop [in mensis lapideis ab episcopis consecratis (P. L., XCVII, 124)]. From the ninth century, however, few traces of the use of wooden altars are found in the domain of Latin Christianity, but the Greek Church, up to the present time, permits the employment of wood, stone, or metal.
II. THE CONFESSIO
Martyrs were Confessors of the Faith -- Christians who "confessed" Christ before men at the cost of their lives -- hence the name confessio was applied to their last resting-place, when, as happened frequently from the fourth century, an altar was erected over it. Up to the serenth century in Rome, as we learn from a letter of St. Gregory the Great to the Empress Constantia, a strong sentiment against disturbing the bodies of the martyrs prevailed. This fact accounts for the erection of the early Roman basilicas, no matter what the obstacles encountered, over the tombs of martyrs; the church was brought to the martyr, not the martyr to the church. The altar in such cases was placed above the tomb with which it was brought into th
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