"pluckedturkeys" (?!) has posted this lovely selection of tunes to youtube from the skene mandore manuscript:
he (i assume "plucked" is a he) is using a plectrum and the instrument sounds remarkably like a charango.
in looking for more information on the mandore, i see that its predecessor was an instrument called a quinterne - a "french and old english name for the cittern" - further info with photo available here:
does anyone know if the "quint" in quinterne refers to tuning in 5ths?
Albert the Magic Pudding
The pic you linked to is the only surviving intact quintern or gittern (and of course many other spellings) in a church in Germany built around 1450, though another was retrieved a couple of years ago from a cesspit in Poland! I don't think anyone really knows the tunings used, but a couple of sources suggest a tuning in 5ths and 4ths - GDgd or GCgc or similar. A couple of useful articles here and here
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