Some scholars, including E. Dubois and James S. Reid, asserts the valley takes its name from the Celtic
Bergalei tribe that inhabited it, a name otherwise lost except for a mention on
Tabula clesiana, a Roman plate. 18th-century documents derived modern Lombard
Bregaglia from Middle Latin
Pregallia ("pre-Gaul, anterior Gaul"). The Latin name
Pregallia was used for the valley from at least the 13th century. ==References==