There is a guy in Latvia named Denis Cherevichnik who is into history of knife fights around the world ( he even wrote a big book about it with deep analysis of literally hundreds of historical sources in several languages and spanning several centuries).
He published an article ( in Russian, unfortunately for most of the Forumites) about Sica, a dog-leg curved Roman ( or Dacian) dagger. To make the long story short, he makes connection between Sica and Shibria. Indeed, they look virtually identical. Whether it is a case of parallel development or of some atavistic feature is uncertain, but the idea is intriguing.
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