The decoration of mitres was characterized by increasing elaboration as time went on.
Magna Carta is an elaboration of the accession charter of Henry I., and is based upon the Articles of the Barons.
No doubt the later indigitamenta (" bidding-prayers") which give us detailed lists of the spirits which preside over the various actions of the infant, or the stages in the marriage ceremony, or the agricultural operations of the farmer, are due in a large measure to deliberate pontifical elaboration, but they are a true indication of the Roman attitude of mind, which reveals itself continually in the analysis of the cults of the household or the festivals of the agricultural year.
George Sand, who was a firm believer in the doctrine of heredity, devotes a whole volume of her autobiography (Histoire de ma vie, 1857 seq.) to the elaboration of this strange pedigree.
The gradual elaboration of the sacrificial ceremonial, as the all-sufficient expression of religious devotion, and a constantly growing tendency towards theosophic and mystic speculation on the significance of every detail of the ritual, could not fail to create a demand for explanatory treatises of this kind, which, to enhance their practical utility, would naturally deal with the special texts and rites assigned in the ceremonial to the several classes of officiating priests.