Doctors also sometimes surmounted their arms with the round cap pertaining to their dignity.
On the monument at St. Albans of Humphrey duke of Gloucester (ob. 1446) his arms are ensigned alternately by his mantled and crested helm, and by a large cap of estate encircled by a crown or coronet. Jasper duke of Bedford (1485) on his seal likewise surmounts his arms with a cap of estate encircled by a delicate crown.
There is not any necessity at the present day to represent any crown or coronet with the cap of estate within it.
[6] L. G. Wickham Legg, English Coronation Records (Westminster, 1901), 223.
[CHAPTER VII]
THE USE OF BADGES, KNOTS, AND THE REBUS
Definition of a Badge; Difference between Crests and Badges; Examples of Badges; The Ostrich-Feather Badge; The White Hart, etc.; Introduction of Badges into Heraldry; Their Prevalence; Allusive Badges; Badges of obscure Origin; Knots and Badges; The Rebus.
Closely allied with crests, but borne and used in an entirely different way, are the devices called badges.