Bianna (Βίαννα) was a young unmarried woman from Biennus (modern Viannos) in Crete, according to Stephanus of Byzantium. After a famine forced a mass emigration, she was among those who fled to an area of Gaul along the river Rhône. During a dance, a chasm opened up in the earth and engulfed her.
Her companions then gave her name to the place, Vienna, which became the capital of the Celtic Allobroges (Vienne in the Dauphiné).
References
Bianna Wikipedia(Text) CC BY-SA