9 FORM, STRUCTURE AND MATERIAL. and one near each corner ; some of them have been restored to their proper use. In very rare cases, of which there is an instance in the baptistery at Ratisbon, the mensa is composed of more than one piece; though this is contrary to ecclesiastical order, for Pope… … Occasionally the front of the altar was enriched with carved arcading and sculpture,2 but after the thirteenth cen- tury the very general rule north of Italy was to leave it a perfectly plain surface of walling, covered by a moveable frontal of any precious material from gold downwards, and in this…
Altars
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