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In page Motto:

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In heraldry, a motto is often found below the shield in a banderole in the compartment. This placement stems from the Middle Ages, in which the vast majority of nobles possessed a coat of arms complete with a motto. In the case of Scottish heraldry, it is mandated to appear above the crest[1] and is called slogan (see: Slogan (heraldry)). The word 'slogan' is an Anglicisation of the Scottish Gaelic sluagh-ghairm (sluagh "army, host" + gairm "cry").[2] There are several notable slogans which are thought to originate from a battle or war cries. In heraldic literature, the terms 'rallying cry' respectively 'battle banner' are also common.[citation needed] Spanish coats of arms may display a motto in the bordure of the shield.[3]