As well as the viol, a lot of mediaeval fiddles were fretted. Usually called "vielle", the design was nowhere near as standardized as the viol or violin and they generally weren't tuned in fifths. They probably make more sense as general-purpose folk instrument than a Hardanger fiddle, and will usually be a lot cheaper.

I saw Andres Mustonen with his group "Hortus Musicus" earlier this year. He led the band playing a vielle for the first (mediaeval) half and a violin for the second (baroque) one. Tremendously powerful performance - used the right way, the vielle is every bit as effective as the violin for showbiz exhibitionism.