My googling says that Priscus is originally a cognomen, and cognomina weren't documented until about 100 BCE. Prisca presumably would have appeared at any time a cognomen was passed to a daughter patronymically (I don't know if cognomina were used for women or not).
I'm sure someone else can give you better info, I really know barely anything about the subject - but I was interested, and that's what I came up with.
- chazda
This message was edited 9/19/2005, 9:54 PM