@Neiljones one tip to find something unique like this is to take a more unusual element - such as the dark red helmet - find that and see what minifigs it comes in (the sets tab). That is how I chase down items such as this. :-) The skirt/leg element is rarer too. Just to help a bit in the future! :-)
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https://www.brickowl.com/search/catalog?query=Praetorian+guard