

Everytime I end up thinking about the François Tomb I end up having to remind myself about the Vibenna brothers. I was sure I’d left myself notes last time but no. On the tomb itself Jacyln Neel has a smart and accessible write up.

Tacitus Ann. 4.65
It may not be out of place to state that the hill was originally named the “Querquetulanus,” from the abundance of oak produced on it, and only later took the title of “Caelius” from Caeles Vibenna, an Etruscan chief; who, for marching to the aid of Rome, had received the district as a settlement, either from Tarquinius Priscus or by the gift of another of our kings. On that point the authors disagree: the rest is not in doubt — that Vibenna’s numerous forces established themselves on the level also, and in the neighbourhood of the forum, with the result that the Tuscan Street has taken its name from the immigrants.”
Varro, LL 5.46

Festus:
TUSCUS VICUS. All other authors say that the Tuscan quarter is the name of that part of Rome which was assigned to those Etruscans who remained in the city, and settled there when Porsena withdrew from it after raising the siege; or else that this quarter received this name, because it was inhabited by the two brothers Caeles and Vibenna, who came from Vulci and whom King Tarquin, it is said, brought with him to Rome. But Varro says that this place was so called because inhabitants of Mount Celia were brought there.
One day I’ll track down the Claudian Speech mentioning Mastarna for completeness and also the epigraphic references…