According to Arthur Charles Fox-Davies, “Heraldry is that science of which the rules and the laws govern the use, display, meaning, and knowledge of the pictured signs and emblems appertaining to shield, helmet, or banner.” Fox-Davies goes on to explain that Heraldry comprises everything within the duties of a herald while Armory is heraldry (the emblems and devises).
The herald was a messenger and proclaimer. Heralds might accompany monarchs on journeys, read official notices in town squares (remember most people couldn’t read), and act as announcers at events. As their status grew, they started wearing a uniform called a tabard. Heralds even went along to war as an observer and to record details, as documented by chronicler Guillaume le Marechal in 1173 at the Battle of Drincourt in Normandy. The heralds would record the coats f arms of those nobles fighting and later, at tournaments, they would announce the combatants (as seen in the movie “A Knight’s Tale”).