In heraldry, dimidation is a type of marshalling in which the two coats of arms are combined by the dividing the shield with a vertical line at the centre, with the dexter half of one coat of arms and the sinister half of the other appearing joined at the middle, rather than fully distinct in the case of impalement. Research Dimidation
In heraldry, marshalling is the combination of two or more coats of arms in the arrangement of an escutcheon to exhibit the alliances of the owners, usually the alliance between two familes joined by marriage. There are three main types of marshalling: impalement; quatering and dimidation. Research Marshalling
 
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