The middle ages was a deeply religious time, and since the bulk of heraldry was developed in countries that were almost entirely Christian it is no surprise that religious and church symbology was widely adopted for use in coats of arms. The crosier Is a typical such usage, being a staff carried by a Bishop in ceremony. As well the adoption of religious imagery for the nobility, the Church itself has made extensive use of arms, such Ecclesiastical Heraldry A Complete Guide to Heraldry, A.C. Fox-Davies, Bonanza (re-print of 1909 Edition), New York, 1978, P600 is a major subject in its own right, somewhat less “martial” than that of the nobility and with its own terms and special meanings.