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Arms of alliance are those
Arms of alliance are those coat of arms
A coat of arms is a heraldic visual design on an escutcheon (i.e., shield), surcoat, or tabard (the latter two being outer garments). The coat of arms on an escutcheon forms the central element of the full heraldic achievement, which in its ...
that families or private persons take up and join to their own to denote the alliances they have contracted by marriage. In England arms of alliance are used exclusively by royalty, with non-royal / commoner armigers impaling the arms of both parties within a single shield.
See also
* Heraldic courtesyReferences
;Attribution * Heraldry {{Heraldry-stub