King-of-Arms

An officer who has jurisdiction over armoury, etc. There are three in England:

Garter, being the principal;

Clarenceux, whose jurisdiction extends south of the Trent and Wales;

Norroy, who officiates north of that river.

In Northern Ireland the heraldic authority is now Norroy following the discontinuation of the office of  Ulster King-of-Arms.

The King-of-Arms for Scotland is The Lord Lyon.

The tabard of a King of Arms is of velvet, with the arms of the sovereign embroidered thereon; that of a herald satin, and a pursuivant's silk. The kings of arms (and heralds) wear an SS collar and the crown of a King of Arms is of silver gilt, consisting of a circle, upon which is inscribed a part of the first verse of the fifty-first Psalm, viz. Miserere mei Deus secundum magnum misericordiam tuum; the rim is surmounted with sixteen leaves, in shape resembling the oak-leaf, every alternate one being somewhat higher than the rest, nine of which appear in the profile view of it: the cap is of crimson satin, closed at the top by a gold tassel, and turned up with ermine (See Crown). This crown is borne over their official arms, which are always impaled with their paternal coats, in the same manner as bishops 

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See College of Arms .