But this I don't get: you said, "the Pre-Roman old Frisians used the Roman decimals". No they didn't they used decimals, not Roman decimals. Even their ciphers are based on the decimal system ( = based on 10 ), but the way they are written is obviously based on the medieval Hindu-Arab ciphers.
I think it were the Gauls who used a sytem based on 20: a remnant of that system can still be found in for instance French: quatre-vingt = 4 x 20 = 80. I think the Germans already used the decimal system during or before Roman times.
Dunno, but I think I was wrong with Germans using the decimal system (base 10):
The vigesimal system appears to have been widely used all over Europe.
According to the OLB the Frisians were there long before the Gauls, the Celts and the Romans. How could they use the vigesimal Gallic or Roman decimal system ? As far as the Gauls are concerned. Didn't they derive their name from Gallus = Haan ?
Edited by Knul, 20 February 2012 - 02:05 PM.