The separate consecration of altars is provided for by canon 14 of the council of Agde in 506, and by canon 26 of the council of Epaone in 517, the latter containing the first known reference to the usage of anointing the altar with chrism. The use of both holy water and of unction is attributed to St Columbanus, who died in 615 (Walafrid Strabo, _Vita S. Galli_, cap. 6).
There was an annual commemoration of the original dedication of the church, a feast with its octave extending over eight days, during which Gregory the Great encouraged the erection of booths and general feasting on the part of the populace, to compensate them for, and in some way to take the place of, abolished heathen festivities (Sozomen, _Hist. Eccles._ lib. ii. cap. 26; Bede, _Hist. Eccles._ lib. i. cap. 30).
At an early date the right to consecrate churches was reserved to bishops, as by canon 37 of the first council of Bracara in 563, and by the 23rd of the Irish collections of canons, once attributed to St Patrick, but hardly to be put earlier than the 8th century (Haddon and Stubbs, _Councils, &c._, vol. ii. pt. 2, p. 329).
When we come to examine the MS. and printed service-books of the medieval church, we find a lengthy and elaborate service provided for the consecration of churches. It is contained in the pontifical. The earliest pontifical which has come down to us is that of Egbert, archbishop of York (732-766), which, however, only survives in a 10th-century MS. copy. Later pontificals are numerous; we cannot describe all their variations. A good idea, however, of the general character of the service will be obtained from a skeleton of it as performed in this country before the Reformation according to the use of Sarum. The service in question is taken from an early 15th-century pontifical in the Cambridge University Library as printed by W. Makell in _Monumenta ritualia ecclesiae Anglicanae_, and ed., vol. i. pp. 195-239.
There is a preliminary office for laying a foundation-stone. On the day of consecration the bishop is to vest in a tent outside the church, thence to proceed to the door of the church on the outside, a single deacon being inside the church, and there to bless holy water, twelve lighted candles being placed outside, and twelve inside the church. He is then to sprinkle the walls all round outside, and to knock at the door; then to sprinkle the walls all round outside a second time and to knock at the door again; then to sprinkle the walls all round outside a third time, and a third time to knock at the door, by which he will then enter, all laity being excluded. The bishop is then to fix a cross in the centre of the church, after which the litany is said, including a special clause for the consecration of the church and altar. Next the bishop inscribes the alphabet in Greek letters on one of the limbs of St Andrew's cross from the left east corner to the right west corner on the pavement cindered for the purpose, and the alphabet in Latin on the other limb from the right east corner to the left west corner. Then he is to genuflect before the altar or cross. Then he blesses water, mingled with salt, ashes and wine, and sprinkles therewith all the walls of the church inside thrice, beginning at the altar; then he sprinkles the centre of the church longwise and crosswise on the pavement, and then goes round the outside of the church sprinkling it thrice. Next reentering the church and taking up a central position he sprinkles holy water to the four points of the compass, and toward the roof. Next he anoints with chrism the twelve internal and twelve external wall-crosses, afterwards perambulating the church thrice inside and outside, censing it.