Times of Israel piece on medieval coins and synagogue in Galilee:
https://www.timesofisrael.com/magnificent-hoard-of-gold-and-silver-coins-sheds-unprecedented-light-on-medieval-israel/
Basically, two jugs of coins found associated with a 14/15th century synagogue, with a Roman synagogue beneath it.
The inclusion in the hoard of a Serbian coin shows that silver is silver, no matter from where!